Abstract: Aiming at the problem that the existing automatic fire cannon can't display the location of the fire zone in real time, an automatic fire control system is designed to display the location of the fire area and the fire scene in real time. A STM32F103C8T6 microprocessor is used to construct the positioning and display control circuit of the fire cannon. A NJM2267 chip is used to process the collected video signal, and the fire alarm video channel is selected by the analog switch CH446Q chip, and the control signal is transmitted by using the RS-485 communication mode. The experimental results show that the system can display the location of fire area and the fire scene in real time, which provides great convenience for fire fighting.