The invention discloses a welding execution terminal of the boom end of a laser welding robot for T-shaped joints of aluminum alloy sheets. The welding execution terminal comprises a framework, a quick coupling on the top of the framework, and a gas supplying and wire feeding support. The framework comprises wing plates on the left side and the right side and a backboard. A hand sliding table is fixed to the backboard. The quick coupling comprises an adapting convex end and an adapting concave end which are in butt joint, and alignment is accurate and quick. The gas supplying and wire feedingsupport can achieve wire feeding and gas supplying and has one degree of freedom of rotation and three degrees of freedom of horizontal movement, and the front end of the gas supplying and wire feeding support is provided with a position sensor for tracking the welding joint. According to the welding execution terminal, the overall flexibility is high, the application range is wide, and a wire feeding pipe and a gas supplying pipe are convenient to adjust and high in precision; mounting and demounting are quick and the degree of automation is high; and the wire feeding position and the gas supplying structure in welding of a T-shaped joint are located in front of and behind a welding pool separately, and the wire feeding position, the gas supplying structure and the welding pool are located in the same plane, so that sliding positioning is achieved, the technical condition of dual-beam laser welding can be met, and the welding quality is ensured.