Pipeline welding clamp for heating and ventilation engineering

The utility model relates to the technical field of pipeline welding, and particularly discloses a pipeline welding clamp for heating and ventilation engineering. Comprising a bottom table and two pipeline fixing units. The two fixing units are symmetrically arranged on the bottom table; the fixing unit comprises a guide rail, a supporting frame, a transverse mechanism and a vertical mechanism. The top of the bottom table is a flat plate provided with a moving seam, and the guide rails are fixedly connected to the flat plate on the two sides of the moving seam. A sliding block is arranged at the bottom of the transverse mechanism and slidably connected with the guide rail. The supporting frame is fixedly connected to the transverse mechanism. The vertical mechanism comprises an adjusting part A and an adjusting part B which are symmetrically arranged on the supporting frame up and down. The adjusting part A and the adjusting part B are fixedly connected to the top end and the bottom end of the supporting fram