The invention relates to a calcaneus sustentaculum tali screw guider which is characterized by comprising a positioning plate, wherein the thickness of the positioning plate is greater than or equal to 7mm; the included angle between the first side edge and the second side edge, which are adjacent to each other, of the positioning plate is 120-140 degrees; through guide holes are formed in the positioning plate; the distance between each guide hole and the second side edge is 15-25mm; the axis of each guide hole is upwards inclined by 23-27 degrees relative to a horizontal plane and is forwards inclined by 28-32 degrees relative to a perpendicular surface. According to the calcaneus sustentaculum tali screw guider, the problems that the screw positioning has to depend on multiple X-ray perspective data as well as the experience and the skill of a surgeon in the prior art are solved. The guider disclosed by the invention is set according to dissection data such as projections on the outer side wall of the sustentaculum tali and is accurate; therefore, harms to a human body during perception are reduced, and manmade iatrogenic complications caused by deviation of a screw position on the sustentaculum tali are reduced; the guider is convenient to use and suitable for wide use and popularization in all levels of hospitals.