The utility model provides a welding clamp plate for fixing a first workpiece and a second workpiece to be welded. The first workpiece and the second workpiece are arranged side by side, and a welding seam to be welded is formed between the two. The welding clamp plate comprises a clamp plate body, an adjusting plate and a wedge; the clamp plate body is welded on the first workpiece in a mode that the clamp plate body is parallel to the welding seam; the clamp plate body comprises a notch; the adjusting plate comprises an upper vertical surface and a second lower horizontal surface; one end of the adjusting plate passes through the notch to enable the second lower horizontal surface to locate above the second workpiece; the wedge extends from the lower part of the second lower horizontal surface and tightly abuts against between the second workpiece and the second lower horizontal surface; and the upper vertical surface abuts against one side surface of the clamp plate body.