The invention relates to a method for producing a surface-densified powder metallurgic gear. The method comprises the following steps of material mixing, powder pressing, sintering, peening, shaping, heat treatment and quality inspection. The gear processed by the method has the advantages that the surface porosity is avoided, the densification degree of the surface can be easily controlled, the number of adjusting times is reduced, the size precision is high, the fatigue-resistance and abrasion-resistance capabilities are improved, the defective rate is greatly reduced, the production cost is reduced, and meanwhile, the performance and the quality are improved.