The invention relates to the technical field of spraying equipment, and discloses an electric arc spray gun for coating spraying. The spray gun comprises a spray gun head, and a contact tube is fixedly arranged on one side, close to a coating spraying side, of the spray gun head. According to the electric arc spray gun for coating spraying, through cooperation of a movable air pipe and a guide wheel, after wires make contact, the guide wheel stops rotating, then the movable air pipe moves towards one side of an air inlet pipe, and an air inlet hole enters the movable air pipe, so that the movable air pipe is in communication with the interior of the air inlet pipe; in the moving process, the wires reach a molten state, and air flow is introduced to blow out the molten coating after the wires are molten, so that the surface temperature of the wire rises quickly, the heat loss in the contact tube is reduced, the spraying time is shortened, and the spraying efficiency is improved; and meanwhile, the wires are connected with the guide wheels in parallel, so that feeding and melting of the wires are carried out alternately to form prepared materials, excessive wires in the contact tube are avoided, and material preparation in the contact tube is smooth.