Steel structure welding positioning device

The utility model belongs to the technical field of steel structures, and particularly relates to a steel structure welding positioning device which comprises a rack, a welding table is fixed to the top of the rack, a protruding stand column is fixed to the corner of the welding table, and a lamp stand is fixed to the top of the stand column. Displacement devices are arranged on the stand columns,guide rails A are installed on the two stand columns which are symmetrical front and back, a guide rail B is arranged between the two guide rails A, the guide rail B and the guide rails A are connected in a sliding mode through a driving device A, and a driving device B is connected to the front surface of the guide rail B in a sliding mode. The position of the positioning device can be adjustedthrough the displacement device; the positioning device is adjusted to the position above a steel structure to be welded, the universal ball rotates in the ball sleeve, laser emitted by the laser positioner directly irradiates