Abstract: The torque of DC asynchronous motor differs greatly from the actual value due to the fluctuation of external load during operation. Therefore, an adaptive adjustment method of DC asynchronous motor torque based on fuzzy PID is proposed. Calculate DC induction motor torque duty ratio, duty ratio directly determines the size of the motor torque. The torque regulation model of DC asynchronous motor is constructed based on fuzzy PID, and the PID control parameters are optimized by fuzzy logic to minimize the deviation between output torque and expected value. The fuzzy PID controller is used to realize the adaptive adjustment of the torque. According to the continuous monitoring of the torque error and its rate of change, the proportional gain, integral time and differential time constant of the PID controller are adjusted flexibly, and the control signal is iterated and optimized continuously until the actual torque of the motor is consistent with the expected torque. The experimental results show that when the rotation speed reaches 1000r/min, the torque obtained in literature 1 and 2 is 10.4Nm and 10.5Nm respectively, while the design formula rule reaches 14.7Nm, which is obviously closer to the actual required torque value. This result shows that the design method can more accurately meet the needs of practical applications.