A sliding mode variable structure integrated decoupling control method for permanent magnet synchronous motor (PMSM) driven by digital twin is proposed to improve the control capability of PMSM. The control structure of permanent magnet synchronous motor based on digital twin technology is constructed. The actual permanent magnet synchronous motor operation data and environmental data are collected through the equipment layer as the source of digital twin drive data. The twin modeling layer constructs the digital twin drive model and virtual scene of permanent magnet synchronous motor based on the data of permanent magnet synchronous motor. After the virtual model is coupled with the virtual scene, the running status of the permanent magnet synchronous motor is restored in the virtual scene; The precise linearization decoupling control method is designed in the twin control layer, and the speed and current integrated sliding film decoupling controller is constructed. In the virtual environment, the decoupling control of the solid motor is completed by solving the nonlinear coupling problem between the speed and current of the permanent magnet synchronous motor; At the same time, the digital twin control structure realizes data exchange and command issuing through twin data transmission between each layer so as to achieve effective motor control. The experimental results show that the permanent magnet synchronous motor can maintain stable current and torque under sudden load and unloading and can rapidly adjust the motor speed to keep the motor running in an ideal state.