The invention provides a spatial light reception demodulation device comprising a four-quadrant photodetector, pre-transimpedance amplifier, a low pass filter, a low noise amplifier circuit, a sampling clock PLL circuit, a high-speed analog-to-digital conversion circuit, an FPGA processing circuit, an output interface circuit, and a photoelectric detector power supply and temperature compensation circuit. The spatial light reception demodulation device provided by the invention adopts the integrated design of precise tracking signals of spatial light positions and light communication signals, integrates spatial light position error tracking calculation with light reception demodulation, thereby simplifying an optical front end of spatial light communication; by means of the amplification of a low noise amplifier and FPGA amplitude detection and control, high sensitivity, wide dynamic range reception and amplification, and precise tracking position error information extraction of spatial light are realized; and meanwhile, by means of the software radio idea, high speed A / D collection and FPGA full digital processing are adopted to realize reception and collection, demodulation and recovery and position error control of the spatial light, and the temperature compensation of the detector.