Abstract: A control method of feeding weight of plastic particles based on speed regulating motor and weight feedback is characterized in that it includes a central processor (71), which is electrically connected to a motor controller (72), and the motor controller (72) drives a actuator (73) to drive a controlled object (74) to complete an operation, so that a mixing bin (4) outputs the corresponding amount of materials, and characterized in that a detection device (75) is set on the controlled object (74), and the detection device (75) is communicated with the central processor (71).