Steel bar welding support for building construction

The utility model discloses a steel bar welding support for building construction, which relates to the field of building construction and comprises a bottom plate, two moving plates are arranged on the upper side of the bottom plate, clamping mechanisms are arranged on the upper sides of the two moving plates, and each clamping mechanism comprises a first fixing block fixedly connected to the upper side of the corresponding moving plate. A fixing plate block is fixedly connected to the upper side of the first fixing block, a hollow groove is formed in one side of the first fixing block, and a spring is fixedly connected to the position, located in the hollow groove, of the first fixing block, so that the problem that a worker cannot smoothly weld the reinforcing steel bar due to the fact that the reinforcing steel bar possibly slides or deviates is solved; according to the reinforcing steel bar welding device, the moving plate can achieve the mounting and connecting effects on the clamping mechanism, the cla