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In recent years, furrowridge potato cultivation with global plastic film mulching technology is widely used in the semiarid areas of the Loess Plateau, this kind of cultivation mode is favorable for mechanical planting, but the difficulty of machine harvest is increased. In order to solve the problems of blockage in the process of digging, poor separation effect, low reliability and white pollution for the complete film mulching, planting line covering and ridge sowing pattern in the dry land of northwestern Chinese Loess Plateau, a potato digger with waste film recollection was designed, which can complete the antiblocking digging, potato separating from soil and film, potato collection and striping, disconnecting the film away from the residue seedlings and the waste film recollection in one process. By theoretical analysis and numerical simulation, the crucial parts, such as bionic digging device, antiblocking crank rocker mechanism, potato and soil separation device, potato and film partition device, residue seedlings and film disconnection device, the waste film recollection components as well as others were analyzed and optimized, and then the performance parameters were determined. Field experiments showed that the potato exposure rate was 97.4%, the potato injury rate was 1.3%, the potato skin damage was 1.8%, the waste film recollection rate was 87.5%, and the productivity can get to 0.17hm2/h, all the index of the potato digger with waste film recollection satisfied the requirements of national and industry standards, the problems such as the mulched potato harvesting and the waste film recollection were solved at the same time.