The invention relates to the field of machining, and provides extrusion flanging equipment of a magnetorheological vibration reducer piston ring for piston ring flanging operation. The extrusion flanging equipment of the magnetorheological vibration reducer piston ring comprises a base body, and a clamping mechanism arranged on the base body; the clamping mechanism is used for clamping the piston ring; the axle of the piston ring is a machining axle; the base body is provided with a first motor, a first transmission mechanism and a machining part; the first motor drives the machining part to rotate around the machining axle through the first transmission mechanism; the machining part includes a sleeve, and a working head arranged on the sleeve; the base body is also provided with a second motor and a second transmission mechanism; and the second motor drives the working head to move corresponding to the sleeve in a direction substantially perpendicular to the machining axle through the second transmission mechanism. The extrusion flanging equipment of the magnetorheological vibration reducer piston ring is stable in feeding, uniform in extrusion, high in machining precision, smooth in surface and free of scratches and bruises.