The coffee bean color sorter adopts a color CCD image acquisition system to realize the comprehensive acquisition of red, green and blue color information of materials. The color of coffee beans ranges from grass green to yellow orange, light cinnamon to dark brown, and the ideal color is dark brown. The color sorter has the feeling ability of human eyes, and the selection of materials is more realistic and meets the requirements; The highest resolution is up to 0.15 mm, which can accurately identify the small defects and spots of raw materials. The high-precision special lens ensures the image is clear and accurate. High quality solenoid valve with high frequency, long service life and low air consumption ensures high machine output, low belt out ratio, low failure rate and low energy consumption; According to the characteristics of large and small particles of raw materials, solenoid valves with different sizes are used.