In order to reduce the loss of life and property caused by fire, an intelligent fire extinguishing vehicle system was designed and developed. This system adopts the structure of upper-lower computer. The STM32 chip is used as the main control chip of the lower vehicle, and the fire extinguishing intelligent vehicle moves along the preset path through the detection path information of infrared photoelectric sensor. The position of the fire source is detected by the flame sensor, and the fire extinguishing operation of the vehicle in manual mode, automatic mode and tracking mode is realized by the algorithm design. The upper computer software is developed by using C# language, and the data transmission between the upper computer and the lower computer is realized through WiFi communication, and the movement control, mode switching, real-time video, fire alarm and other functions of the upper computer PC to the car are realized through the program design. According to the test, the intelligent fire-extinguishing trolley system designed in this paper can well complete the fire-fighting work in three modes.