The invention discloses a steel pipe punching device for building construction. The steel pipe punching device comprises a base, a sliding rail is installed on the base, a ring sleeve is installed inthe sliding rail in a sliding mode, an annular cavity is formed in the ring sleeve, a rotating ring is rotationally clamped on the inner side of the ring sleeve, a sleeve is fixedly installed on the rotating ring, a telescopic ejector rod is movably sleeved with the sleeve, a punch is installed at the extending tail end of the telescopic ejector rod, and a hydraulic device communicating with the annular cavity is installed on a sliding block; a rotating motor is installed on the outer wall of the ring sleeve, a gear is rotationally installed at the output end of the rotating motor, a gear ringis arranged on the inner wall of the rotating ring, and a controller is installed on the sliding block; and a transverse moving mechanism is arranged on the sliding rail, and clamping assemblies arearranged at the two ends of the sliding rail. According to the steel pipe punching device for building construction, a steel pipe is clamped and fixed through the clamping assemblies, the ring sleeveis driven by the transverse moving mechanism to move transversely along the steel pipe, and meanwhile, the punch can rotate around the circumferential direction of the steel pipe to any angle, and therefore punching operation of the steel pipe at different positions and angles is achieved, adjustment is convenient and flexible, the punching precision is high, and the punching efficiency is improved.