Friction disc type hydraulic differential lock for driving axle

The utility model provides a friction disc type hydraulic differential lock for a driving axle. The hydraulic differential lock comprises big and small O-shaped seal rings, an angular contact ball bearing, a piston, a coupling flange, a limiting shield ring for an axle, an adjusting shim, a guide pin, a cone transmission bearing, stators, friction discs and a differential gear, wherein the piston is installed in the cone transmission bearing by equilibrium pressure, and the circumferential rotation of the piston is limited by the guide pin; the differential gear is arranged in a cavity body of the cone transmission bearing; the big O-shaped seal ring, the angular contact ball bearing and the coupling flange are sequentially installed on the piston; and the stators and friction discs are sequentially and alternately installed on the differential gear. According to the utility model, when one wheel skids, other driving wheels are guaranteed to obtain adequate driving force; and the friction disc type hydraulic