Skin preparation knife

The utility model discloses a skin preparation knife, and relates to the field of medical supplies. The utility model provides a skin preparation knife integrating liquid soap and a liquid soap applying tool. The skin preparation knife comprises a knife handle, a blade seat, a blade and a blade cover, the blade seat is connected with the knife handle, the blade is placed on the blade seat, the blade cover is detachably connected with the blade seat and compresses the blade, and the blade seat is provided with a first comb tooth structure corresponding to a cutting edge of the blade; the tool further comprises a liquid soap bag, a tool handle cover and a smearing brush. The knife handle is provided with a liquid soap bag hole, a connecting flange and a piercing protruding groove. The liquid soap bag is placed in the liquid soap bag hole, and the liquid soap bag is filled with liquid soap; the knife handle cover covers the connecting flange and seals the liquid soap bag hole, and a puncture protrusion is arrang