The invention relates to a righting structure for preventing a sucker rod pump plunger from eccentrically-wearing. The righting structure for preventing the sucker rod pump plunger from eccentrically-wearing comprises a righting device, an equal-diameter sucker rod, a pump cylinder, and the plunger. The righting device and the plunger are coaxially arranged in the pump cylinder, the righting device is located at the outer end of the plunger, and an outer wall of the righting device is in threaded fit with an inner wall of the pump cylinder; and a sucker rod guiding hole is formed in the center of the righting device in the axial direction, one end of the equal-diameter sucker rod penetrates through the sucker rod guiding hole and is connected with the plunger, and an oil-through hole is formed in the righting device. According to the righting structure for preventing the sucker rod pump plunger from eccentrically-wearing, the righting device is installed on the inner wall of the upper end of the pump cylinder, and loading of the plunger and the sucker rod is not increased; and the plunger connected with the equal-diameter sucker rod is always located at the center of the pump cylinder through a limiting effect of the righting device on the equal-diameter sucker rod, and the problem of eccentric wear of the plunger is solved.