The invention belongs to the technical field of mechanical engineering, and particularly relates to a full hydraulic transmission-based crawler bulldozer. The full hydraulic transmission-based crawler bulldozer consists of a bulldozer blade, a hydraulic oil cylinder, a push rod, a body, a cab, a frame, a track roller, a carrier roller, a drive sprocket, a crawler track, an engine, a variable hydraulic pump, a hydraulic motor, a crawler drive axle, a hydraulic hose and couplings, wherein the upper part of the bulldozer blade is hinged with the hydraulic oil cylinder; the wall of the hydraulic oil cylinder is fixed to the body and the cab; the lower part of the bulldozer blade is hinged with the push rod; the push rod is hinged with the frame; the frame is positioned on the crawler track through the track roller; the front part of the frame is provided with a guide roller, and the upper part of the frame is provided with the carrier roller; the engine is connected with the variable hydraulic pump through a first coupling; the variable hydraulic pump is connected with the hydraulic motor through the hydraulic hose; the hydraulic motor is connected with the crawler drive axle through a second coupling; the crawler drive axle drives the drive sprocket; and the drive sprocket is engaged with the crawler track. The engine can be flexibly arranged because the hydraulic hose for conveying hydraulic fluid has the characteristic of flexibility. The full hydraulic transmission-based crawler bulldozer realizes stepless transmission of the bulldozer in a true sense; the power of the hydraulic motor cannot be interrupted during a variable-displacement gear change; and the operation is simple.