Anti-rotation rear plug

The utility model relates to an anti-autorotation type rear plug which comprises a seat body and a plug block which are assembled in a front-back mode. A groove is formed in the rear end face of the seat body in a forward concave mode, an anti-skid groove communicated with the groove is formed in the front end face of the seat body in a backward concave mode, and the inner diameter of the anti-skid groove is smaller than that of the groove. The anti-skid block is arranged on the front end face of the rear plate part in a protruding mode, the cylinder part is formed by integrally extending forwards from the front end face of the anti-skid block, a notch is formed in the anti-skid block, and the inner contour of the anti-skid groove is matched with the outer contour of the anti-skid block in shape and size. The blocking block is arranged in the base body from back to front, the rear plate part is arranged in the groove in a matched mode, the front end face of the rear plate part abuts against the inner front wa