The utility model relates to a special welding fixture for an electric locomotive cowcatcher. The special welding fixture comprises a planeness control board with supporting feet, wherein, the planeness control board is equipped with a front contour control board, a side contour locating plate and a compression device; the side contour locating plate is equipped with a side vertical locating plate, a locating reinforcing rib and an adjusting device; the front contour control board is equipped with a front contour control reinforcing plate, a reversely deformed plate, a clamping device for clamping a front moldboard on the cowcatcher, and a front angle locating plate. The special welding fixture has the advantages of novel design, simple structure, reduced labor intensity, and improved operating efficiency, and is convenient in welding and assembly, ensures the contour dimension of the cowcatcher, can control the welding deformation and ensure the product quality; and the special welding fixture is particularly applicable to the cowcatcher of a 7200KW six-axis locomotive so as to ensure the contour of the 7200KW six-axis locomotive and control welding deformation.