High-precision radiometric performance test and calibration of field detectors are one of the important steps in the development of low-light level instruments and sensors. With the rapid development of low-light night vision instrument, photon microscope, low-light fluorescence imaging, biomedical imaging, and deep space exploration, higher requirements are put forward for the calibration light source of low-light level devices. Image intensifier is the core component of low-light night vision system, and its illuminance response range should be as low as 10^-4 lx. The signal-to-noise ratio and optical gain of image intensifier play a decisive role in the imaging quality of the whole low-light detection system. To meet the high precision calibration requirements of low-light level sensors such as low-light image intensifier, a wide dynamic range low level illumination source with small volume and low power consumption is designed. Aiming at the requirements of the field radiometric response characteristics test of low-light level detectors, the design scheme, structure, and working principle of the wide dynamic range low-light level illumination source are first introduced. The wide dynamic range illumination source is composed of an adjustable dynamic range integrating sphere light source unit, a cylinder aperture and a feedback and control unit. The integrating sphere light source adopts the structure of child integrating sphere and parent integrating sphere. A halogen lamp source is built into the child integrating sphere, and the light is reflected several times inside the integrating sphere to achieve uniform brightness at the outlet. An adjustable aperture between the parent and child integrating spheres is used to realize the function of wide dynamic range flux adjustment. The area of the adjustable aperture determines the flux of light from the child integrating sphere into the parent integrating sphere. Compared with the way in which the flux of halogen light is regulated by the current of the source, it ensures that the color temperature of the light source is nearly consistent at different orders of magnitude of brightness output. The integrating sphere provides luminous flux to the monitoring detector and the cylinder aperture through two openings. The cylinder aperture is arranged at the outlet of the parent integrating sphere, and the position is coaxial with the parent integrating sphere outlet. The cylinder aperture is a cylindrical structure with an entrance aperture and an exit aperture, and has a stray light baffle inside, which can convert the brightness source of the integrating ball into a uniform illuminance source. Illuminance feedback and control module is used to display illuminance value of light source in real time and realize the setting of illuminance value. The dynamic range of low-light illuminance source is derived in detail, and the design parameters of light source are analyzed and simulated. Finally, the illuminance source performance test is carried out to verify the rationality of the design. The stability of the light source is tested. The standard detector is placed at the light source outlet to monitor the photocurrent of the detector. The test results show that the instability of the light source is less than 0.001 8%. The illumination feedback coefficient of monitor detector is calibrated by a standard illuminance meter, the illumination range of the light source measured by the monitoring detector is 3.8× 10^-6 lx~12 lx. The experimental results show that the wide dynamic range low-light level illuminance source has many technical advantages, such as wide dynamic range regulation, high stability. In the field or laboratory environment, it has a certain application value for radiometric calibration and characteristic test of low-light level detector such as image intensifier.