The invention discloses a self-locking type running wheel and relates to the technical field of suspension bridge main cable overhauling. The self-locking type running wheel comprises a first pressureresistant steel plate; a buffering mechanism is mounted on the upper surface of the first pressure resistant steel plate; a frame is arranged at the lower part of the first pressure resistant steel plate; a bearing is fixedly embedded in the internal top wall of the frame; the bottom end of the buffering mechanism penetrates through the first pressure resistant steel plate and is fixedly connected with the inner ring of the bearing; a limiting bolt is fixedly connected to the upper surface of the frame; and a bolt limiting groove is formed in the upper surface of the first pressure resistantsteel plate. According to the self-locking type running wheel, as positive and negative screws are arranged at the two ends of a bearing rod of a concave surface wheel, a rotating spanner is arrangedat one end of the bearing rod, limiting steel plates are arranged on the positive and negative screws, the upper ends of the limiting steel plates are fixed by steel plate limiting grooves, and inclined rod limiting grooves are formed in the lower ends of the limiting steel plates, an overhauling vehicle can only run in a designated direction; when the overhauling vehicle moves back, the running wheel can be automatically self-locked; and therefore, personal safeties of operation personnel on the vehicle and the safeties of riding workers under the main cable are greatly guaranteed.