The invention provides a plastic working process for improving the damping property of a high-strength wrought magnesium alloy. The plastic working process includes the following steps: plastic deformation by extrusion: a magnesium alloy ingot is extruded on an extruder, the technical parameters are that the extrusion temperature is 350-400 DEG C, the extrusion ratio is 9-15, the extrusion speed is 2-8m/min and the speed is constant; upsetting type forging treatment: the wrought magnesium alloy treated by extrusion and plastic deformation is upset after keeping the temperature of 380-400 DEG C for 1-2 hours, the temperature of the magnesium alloy ingot at upsetting is 315-375 DEG C, the upset rate is 30%-40%, and the strain rate of upsetting is 0.001-0.01/s. The plastic working process of the invention can greatly improve the damping property of the high strength wrought magnesium alloy and guarantee good mechanical property simultaneously, and successfully solves the contradiction between the strength and the damping property of the magnesium alloy. The wrought magnesium alloy treated by the plastic working process has wide application fields, and can satisfy the actual requirement for high-strength, high-damping and light-weight materials in the fields of high speed train, automobile, aeronautics and astronautics, national defense, military industry, etc. In addition, the process equipment used in the plastic working process is the conventional universal equipment which is low in cost.