The invention relates to a machining method for a nut plate and belongs to the field of machining of alloy materials. The machining method includes the following steps that pretreatment is carried out, and quenching and tempering are carried out on high-strength alloy steel; heat treatment is carried out, the quenched and tempered high-strength alloy steel is forged and formed at the temperature of 1150-1220 DEG C, heat preservation is conducted for 0.3-0.6 h, quenching treatment is carried out by means of forging waste heat, the high-strength alloy steel is immediately water-cooled to the room temperature when cooled to 900 DEG C, the high-strength alloy steel is heated to 450-520 DEG C to be subjected to tempering for 2-3 h, finally the high-strength alloy steel is oil-cooled to the room temperature, and a semi-finished nut plate is obtained; and surface treatment is carried out, the semi-finished nut plate is sequentially subjected to oil and rust removal, activating treatment, blackening and passivation, and the nut plate is obtained. According to the nut plate, the high-strength alloy steel with components combined reasonably is selected to be subjected to quenching and tempering, forging, quenching, tempering and surface blackening, so that the machining cycle is greatly shortened, and the strength, hardness, toughness, corrosion resistance and abrasion resistance of the nut plate are greatly improved; meanwhile, the machining performance of the nut plate is improved, and the nut plate is easy to weld.