Welding auxiliary equipment for machining

The utility model belongs to the technical field of machinery, and particularly relates to welding auxiliary equipment for machining, which comprises two symmetrical supporting columns, namely a first supporting column and a second supporting column, a first lead screw, two bearings and two square nuts are arranged in the supporting columns, and lead screw threads of the first lead screw are opposite up and down by taking the middle part of the lead screw as a boundary. The two square nuts are respectively connected with a clamping plate, each clamping plate is of a combined structure with an arc-shaped structure in the middle and plate-shaped structures on the two sides, a plurality of clamping strips are arranged on the plate-shaped structures, and the clamping plates achieve the clamping or loosening function through upper and lower opposite threads of the first lead screw. A workpiece is clamped and fixed with appropriate force which does not damage the workpiece in a hand-cranking mode, and the clamping