The invention provides a high-power motor operating mechanism control device and method, and relates to the technical field of electrical automation control. The control device comprises a rectification unit, a voltage stabilizing capacitor, a buck-boost converter, an energy storage device, a signal acquisition unit, a signal processing unit, an inverter, a main controller, a current conditioningcircuit, a position signal conditioning circuit, a capacitor voltage detection unit, an upper computer, a PWM isolation driving unit and a low-voltage DC power supply. The upper computer issues different control instructions to the main controller when a circuit breaker breaks short-circuit current, rated current and no-load working conditions; the main controller sends an instruction to the buck-boost converter and the inverter, the buck-boost converter provides different voltage values for the energy storage device, and a motor operating mechanism moves according to a preset ideal travel speed curve of a moving contact. According to the control device and the control method, the rigid collision between the moving contact and a static contact is effectively reduced, and the reliability ofthe motor operating mechanism of a high-voltage circuit breaker is improved.