The invention discloses an inclined surface anti-self-locking vehicle anti-rubbing deceleration device. The device comprises a support shell body, and a pressure bearing body arranged at the upper end of the support shell body in a sliding mode. The center of the support shell body is provided with an inclined surface anti-self-locking mechanism which is squarely located at the lower side of a central slide column and fixedly connected with the support shell body. The inclined surface anti-self-locking mechanism comprises a sleeve cylinder, an upper gear rod slidingly arranged in the sleeve cylinder, a lower gear rod arranged in the sleeve cylinder and located at the lower side of the upper gear rod. Three guide plates arrayed circumferentially at average intervals are arranged at the inner wall of the sleeve cylinder. The interval between adjacent guide plates is provided with a guide rail. Three upper guiding bars which are circumferentially arrayed at average intervals are arranged on the upper gear rod. An upper inclined gear with an opening facing downward is arranged at the bottom of each upper guiding bar. The interval between adjacent upper guiding bars is provided with an upper guiding groove. Three lower guiding bars which are circumferentially arrayed at average intervals are arranged on the lower gear rod, a lower inclined gear with an opening facing upward is arranged at the upper end of each lower guiding bar.