The invention discloses a pushing-type rotary guiding device based on drilling hydraulic pressure difference. The pushing-type rotary guiding device comprises a drilling tool body and a drill bit, wherein the drilling tool body is internally provided with a mud flow channel, at least three mounting grooves arranged at equal spacing are formed in the outer wall of the drilling tool body in the circumferential direction, the mounting grooves are provided with pushing mechanisms, and the drilling tool body is further provided with a liquid inlet hole; the pushing mechanisms comprise cover plates,pushing pistons, normally open valves and driving mechanisms, piston mounting grooves and liquid outlet holes are formed in the outer wall of the cover plates, the pushing pistons are fixedly installed in the piston mounting grooves, and the driving mechanisms are connected with the normally open valves; and the driving mechanisms are used for driving valve cores of the normally open valves to move between the first positions and the second positions, when the valve cores are located in the first positions, first liquid outlets communicate with second liquid outlets, and when the valve coresare located in the second positions, liquid inlets communicate with the second liquid outlets. The pushing-type rotary guiding device uses the pressure of drilling fluid to drive the pushing pistons,and has the advantages of simple structure, fast response speed and convenient arrangement.