An image processing and automatic control circuit based on field programmable gate array（FPGA）EP3C25F256I7 is designed.A series of visible light image processing and control functions,including histogram equalization,median filter,cross overlay and rapid auto-focusing are realized in the circuit.As the processor chips used in the circuit are high-performance and low-power,the entire circuit has some good performances,such as good stablility,real-time,small size,high precision and so on.