In many fields of production and life, the demand of environmental detection is increasing, but there are many spaces that are not suitable for human activities or exist certain risks. For the detection operation of the above special circumstances, it need to design a number of intelligent detection car to complete. The design uses the upper and lower monitor structure. Using a STM32 as the core, the lower monitor realizes four control functions, which are the car motion control, environment detection, automatic obstacle avoidance, and WiFi communication with the upper monitor. The combinational characteristics of ultrasonic and infrared sensors are used to detect obstacles and improve the stability of obstacle avoidance. In the laboratory environment, using the interface developed by VC++ on the PC to set up running and control parameters of the car, the test of the design meets the expected design requirements.