The invention discloses a water injection pump motor moving device comprising a slideway, a U-shaped support, a clamping structure and a stepping push structure. A water injection pump motor is arranged on the slideway, the edge of the slideway is provided with a protruding angle-iron edge, the bottom of the slideway is provided with a vertical groove, and the groove is placed at the inner side of the angle-iron edge. The U-shaped support includes a first supporting leg and a second supporting leg which are fixedly connected with each other at the bottom. The first supporting leg is inserted into the groove. The stepping push structure vertically penetrates through the upper portion of the second supporting leg, and the clamping structure vertically penetrates through the lower portion of the second supporting leg. The water injection pump motor is placed on the slideway with the angle iron edge, the angle iron edge is clamped and fixed by the first supporting leg and the clamping structure, the stepping push structure in the upper portion of the second supporting leg gradually moves to and pushes the water injection pump motor, the strength and position of the stepping push structure are both controllable, and therefore, damage to the motor is avoided. The water injection pump motor moving device is simple in structure, convenient to operate, and safe and reliable.