The invention relates to a skin scraper capable of scraping in a reciprocate manner and effectively solves the problem that skin is inconveniently scraped and scraped in an unhumanized manner in an existing skin scraping process. According to the technical scheme, the skin scraper comprises two supporting rods, wherein a pressure box is arranged on the supporting rods; a sleeve is arranged under the pressure box; a piston moving up and down is arranged in the sleeve; a supporting rod is arranged on the piston; an arc-shaped scrape blade is arranged at the other end of the supporting rod; baffle plates are arranged inside the pressure box and are connected through a tension spring; a rotary rod is arranged between the two baffle plates; a first gear is arranged above the rotary rod; two second gears engaged to the first gear are arranged below the first gear; the two second gears are separately placed on the front and back sides of the first gear; the axes of the two second gears are located on the same horizontal plane; a screw is fixed to each of the second gears; the two screws are opposite in direction; and a nut fixed to the corresponding baffle plate sleeves each screw. The skin scraper is novel in conception, skillful in structure and high in practicality.