Robot fixed-point welding auxiliary device and welding method thereof

The invention discloses a robot fixed-point welding auxiliary device and a welding method thereof. The robot fixed-point welding auxiliary device comprises a connector, a main body piece, a limiting plate, a trigger plate and a protection plate structure. According to the robot fixed-point welding auxiliary device, by designing the robot fixed-point welding auxiliary device, in the welding process, when the trigger plate does not make contact with the second workpiece, the protection plate structure does not incline and contract, the situation that a welding gun damages the positioning tool is avoided, the bottom of the trigger plate abuts against the second workpiece and is used for pressing the first workpiece and the second workpiece, and the welding quality is guaranteed; and a limiting plate is designed, the lowest point of downward movement of the welding gun can be limited, the welding gun is prevented from colliding with the positioning tool, and therefore stable work of fixed-point welding is guarant