In this study, an infrared integrating sphere radiation source with high uniformity and wide dynamic range is designed to satisfy the high-precision calibration and performance testing requirements of infrared remote sensors. The designed radiatioin source adopts a carbon fiber quartz electric heating tube as the infrared radiation medium. The sphere's working band covers 3-15 μm. Based on the cavity radiation theory of integrating spheres and the blackbody radiation theory, the uniform-light mode of child and parent gold-plated integrating spheres is proposed. The proposed mode effectively improves the uniformity of the infrared integrating sphere. A programmable gold-plated aperture is also designed to realize the linear adjustment of the dynamic range. The relationship between temperature variation and radiance output stability and the temperature control accuracy of the child and parent gold-plated integrating spheres are determined. Characteristics of the infrared integrating sphere are analyzed and tested. Results reveal that the uniformity of the infrared integrating sphere in the area of Φ200 mm of the normal at the light exit is 98.87%, the angular uniformity from -15° to 15° in vertical plane is 99.69%, the dynamic range is nearly linearly adjustable, the background radiation is less than blackbody radiation at the same temperature, and the instability is 0.16%. These results demonstrate that the infrared integrating sphere possesses excellent performance. The infrared integrating sphere calibration source is an effective supplement to the traditional blackbody radiation source and has potential application value in the laboratory spectral radiometric calibration of infrared remote sensors.