In recent years, frequent fire accidents have caused a great threat to people's lives and property safety, but also threaten the safety of firefighters. This paper by comparing the current technology of different smart cars, we choose the open source, the hardware performance is more stable and support the rapid development of the Arduino microcontroller as the main control chip combined with WiFi technology for the design of intelligent fire extinguisher. Infrared sensor with H bridge driving principle complete the obstacle avoidance tracking function. The flame sensor detects the fire source, and the signal is transmitted back to the MCU to start the fan to com- plete the extinguishing function. Mobile phone Android software to complete the control function of the mobile terminal through the WiFi module of the router and the camera.