The invention discloses a cambered axle-type hydraulic variable motor belonging to hydraulic motors, and aims to provide a hydraulic variable motor capable of limiting the offset degree of an allocating pair. The cambered axle-type hydraulic variable motor comprises a housing (21), an output shaft (1), a valve plate (8) and a regulator; a rotary mechanism is composed of a center rod (5), a cylinder (19), a plunger (4) and a spring (3); the regulator is composed of a regulator housing (17), a valve plug (15), a spring seat (15), a spring seat rod (10), a reset spring seat (11), a pressure regulating spring seat (12), a pressure regulating spring (13), a reset spring (14), a flow piston (18) and a driving rod (9); the center rod (5) and the driving rod (9) are respectively connected with the sphere head of the valve plate (8); and a support ring (6) sleeved on the center rod (5) in a hollow manner is fixed in the cylinder body (19). The hydraulic variable motor can prevent the motor from failing under the repeat surge pressure of the system.