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Moving target tracking system is to realize an intelligent car to recognize, track and track moving objects. Using the intelligent path planning method, with the help of the STM32 master control chip, based on its rich hardware resources, connected the programmable OPENMV camera module, motor driver module, motor and encoder, and used C language for control programming, designed a moving target tracking system. The camera collects images of the object, calculates the coordinates of the object and the distance between the object and the car, and sends them to the main controller. The main controller takes the coordinates of the car and the distance from the car to the object as the input of the PID algorithm, adjusts the PWM to control the motor operation through the optimized PID algorithm, and completes the tracking and tracking of the object. The experimental results show that under the control of the optimized PID algorithm, no matter the object is moving or stationary, the car can track the object more quickly and stably than the traditional PID algorithm, until the car tracks the object and keeps the relative static state stably.