The influence of out-of-band leakage on the measurement of ultraviolet (UV) band by traditional filter radiometer is serious. The solar blind phototube is used as the detection unit of the UV filter radiometer, the system-level relative spectral flux responsivity of each channel of the solar blind UV filter radiometer is measured by the built comparison measurement device, and then the absolute spectral irradiance responsivity of the UV filter radiometer is calibrated by using the irradiance standard lamp traced to the Nation Institute of Metrology, China (NIM). The monochromator system is used to complete the comparison between the UV filter radiometer and the standard detector traced to National Institute of Standards and Technology (NIST), and the maximum difference between the two results is 2.09%, which verifies the accuracy of radiation standard transfer. Finally, through the construction of solid angle, the 232--400 nm radiation standard is transferred to the UV integrating sphere radiation source with large aperture and large dynamic range.