The utility model discloses a simple electromotor-pulley pulling-out device and belongs to the technical field of oil pumping machines in oil exploitation. The pulley pulling-out device is of a frame structure, a semicircular opening is formed in one end face of the frame, and the bottom face of a base of a jack is connected to the other end face of the frame. The semicircular opening of the frame is sleeved on an output shaft of a motor to be tightly attached to a belt pulley and ejected on the shaft head of the output shaft of the motor by the utilization of an ejector rod of the jack, and the belt pulley is pulled out through a hydraulic device of the jack. The simple electromotor-pulley pulling-out device has the advantages that the electromotor belt pulley is very easy to pull out, the belt pulley is not prone to being damaged due to the fact that stressed area is large and even, and the simple electromotor-pulley pulling-out device is particularly applicable to being used for large belt pulleys, easy to manufacture and convenient to operate.