The invention discloses a step type impact spiral drill. An outer hexagonal joint is fixed on an impact spiral drill rod by virtue of a pin, a nut, a cotter pin and a fastening screw; an impactor and the outer hexagonal joint are connected together through API threads; and a support sleeve is arranged between the impactor and the impact spiral drill rod; a spiral blade and drill teeth are welded to the impact spiral drill rod, a front drill tooth distribution line of the spiral blade forms an included angle with a central axis of the spiral drill and is distributed in a cone manner. A bottom drill bit of the impactor forms a height difference with the front drill teeth of the impact spiral drill rod and is of a step shape; and in a drilling process, the impactor is utilized for crushing a rock stratum to form a free face, and the drill teeth on the spiral blade are utilized for carrying out peel drilling, so that the drilling efficiency is substantially improved.