The invention belongs to the technical field of construction engineering, and particularly relates to a steel bar welding platform for construction engineering. The steel bar welding platform aims tosolve the technical problem that the welding steel bar needs to be quickly cooled after rust and welding of a welding head need to be removed; the following scheme is provided, the steel bar welding platform comprises a main body, a water tank is fixedly connected to the inner wall of the bottom end of the main body, and an atomizing nozzle is fixedly arranged in the middle of the inner wall of the bottom end of the water tank; a strip-shaped through hole is formed in the top end of the main body, the main body is fixedly connected with two fixing boxes at the strip-shaped through hole, motorsare fixedly installed on one sides of the inner walls of the bottom ends of the two fixing boxes, first through holes are formed in one sides of the top ends of the fixing boxes, and grinding structures are arranged at the position of the first through holes, the and the grinding structures comprises fixing plates. According to the steel bar welding platform, the edge and the cross section of thewelding head can be ground through the grinding structures, so that the rust on the surface of the steel bar can be removed, so that the welding of the steel bar welding platform is more stable, andthe spraying can be blown upward through the blowing, so that the cooling of the welding head is accelerated.