The invention relates to a tibial talocalcaneal joint fusion screw placement guider which comprises a screw placement guider, wherein the screw placement guider comprises a guide plate and a mounting support; the guide plate is an arc-shaped strip plate, the guide plate comprises a front guide section, a middle arc-shaped section and a rear guide section, a 90-degree angle is kept between the front guide section and the rear guide section, the two ends of the middle arc-shaped section respectively bend for 90 degrees and are connected with the front guide section and the rear guide section, and screw placement mounting holes distributed in one row are distributed at the middle part of a plate; and the mounting support is U-shaped, and two tail ends of the U-shaped mounting support are hinged with the two sides of the guide plate. The guider provided by the invention can carry out accurate positioning on the bone surface of calcaneus, the operation is convenient, the tibia, ankle bone and calcaneus can be accurately connected together, and thus the operation success rate is improved.