The invention discloses a loader-digger which comprises a loader-digger body. A shovel loader is arranged at the front end of the loader-digger body. An electric system is arranged at the back end of the loader-digger body. A water system is arranged on one side of the electric system on the back portion of the loader-digger body. A hydraulic system is arranged in the middle position of the loader-digger body. A lower grounding part of the loader-digger body is designed to be a traveling system with tracks on two sides. The travelling system is composed of track supports, hydraulic motors fixed on the track supports, drive wheels arranged on the hydraulic motors, and the tracks which wrap the track supports and are driven by the drive wheels. Two connecting plates are welded on the inner side of each tracking support. The traveling system of the loader-digger is composed of the track supports and the like, and a rack and traveling devices can be separated as long as bolts are detached when transport hoisting is needed, so that the size and the weight of hoisting operation are reduced.