The invention provides a machining method for the welding position of the end of a metal rod for a vehicle. The machining method comprises the following steps of blanking of the metal rod, swelling upsetting of the end of the metal rod, the first time of heat treatment of the end of the metal rod, machining forming of the metal rod, welding of the end of the metal rod and the second time of heat treatment of the end of the metal rod. In the machining method, through swelling upsetting of the end of the metal rod, the problem that the wall thickness of the end of the metal rod is decreased dueto a single swelling process for the end of the metal rod is solved; and through heat treatment before the welding process and heat treatment after the welding process, damage to the metal rod due toother processes is avoided while the appropriate hardness of the metal rod is guaranteed.