The control performance of permanent magnet direct drive system of belt conveyor is poor when PID is used for speed regulation control, and the problems of asynchronous speed and poor stability between motors occur when multiple permanent magnet motors are used to drive at the same time. The active disturbance rejection synchronous control strategy of multi-permanent-magnet-motor drive system of belt conveyor is proposed. Based on the active disturbance rejection control (ADRC) technology, two speed control strategies are designed and the comparative experiments are carried out by building a simulation model. The optimal speed control strategy is selected, and the structure of the traditional deviation coupling control is improved by combining fuzzy PID control. Taking the multi-permanent-magnet-motor drive system as the control object, the synchronization control experiments based on the master-slave, the traditional deviation coupling and the improved deviation coupling synchronization control structures are carried out. The results show that the synchronous control strategy of multi-permanent-magnet-motor drive system for mining heavy belt conveyor based on second-order ADRC and improved deviation coupling control structure has better anti-interference ability, control accuracy and synchronization.