This study aims to enhance the understanding of broadband background light radiation and fulfill the requirements for the real-time measurement of sky background radiation for scientific research and experiments. A broadband sky background light radiometer was developed that is capable of full sky scanning and fixed-point observation, thereby broadening the measurable wavelength range. The radiometer successfully measured integrated radiance across the 200?2500 nm band. This paper presents the equipment's overall structural schematic and details the development plans for each subsystem component along with comprehensive technical specifications, calibration principles, and experimental procedures. An analysis of the equipment's uncertainty confirmed its reliability by meeting the predefined uncertainty requirements. The radiometer was employed for field measurements in the Changchun area, and the data underwent preliminary analysis. The findings were consistent with the expected radiation variation laws, offering a novel and efficient method for scientific research and practical applications.