In order to meet the requirements of ultra-high precision calibration for global climate observation and quantitative remote sensing, a prototype system based on spontaneous parametric down-conversion self-calibration radiation reference source was developed. The design was fully considered to be modular, lightweight and integrated. The static analysis of the key part of the detector module showed that the position of the detector's photosensitive surface was shifted by 21 μm, the photosensitive surface of the detector was 180 μm, and the diameter of the photon spot of the lens was 16 μm. The spot could be fully detected, which met the design requirements. A low-light camera was used to observe the photon spots in front of each detector, the results showed that the spot shape was regular and the size was complete. The single photon detector was used to collect the relevant photons. The eight-channel four-pair correlated photon matching peaks were drawn by the coincidence measurement, and the principle was verified. The machine structure was well designed to meet the design goals.