The invention relates to a foot bone fixator, which comprises an ankle restricting device and a palm fixator, wherein the ankle restricting device comprises a leg fixing ring and an ankle covering plate, the leg fixing ring is fixedly connected with the ankle covering plate, the palm fixator comprises a palm support part, a foot back fixing assembly and a support pad, the palm support part comprises a palm support plate and a fixing part, the fixing part is fixedly connected with the palm support plate, the fixing part is rotationally connected with one side, backing to the leg fixing ring, of the ankle covering plate, the foot back fixing assembly comprises N arc-shaped fixing rods A, the two ends of the fixing rods A are fixedly arranged on the two sides of the palm support plate in the width direction, the middle part of the palm support plate is provided with a hollow hole corresponding to the palm surface, a plurality of fixing rods B are arranged inside the hollow hole in a parallel array way, a bone surface fixing assembly is arranged between the foot back fixing assembly and the palm fixing plate, and comprises fixing blocks arranged on the fixing rods A and the fixing rods B, and fixing cables are arranged among the fixing blocks.