The intelligent car is an important part of the mobile robot. In this design, the input signal of each module sensor is detected in real time, the black line of the infrared tube is used to track, the obstacle is avoided by the photoelectric sensor, the AT89C51 with large storage space is used as the main control chip, the L298N chip is used for the car motor drive, and the left and right two cars are controlled respectively according to the built-in program The DC motor operates to realize the automatic identification of the route of the car, and can effectively control the turning angle and track driving when it encounters obstacles. And add the voice control module to realize the sound control of the car. The structure of the design is simple and easy to realize, which to a certain extent reflects the intelligent technology.