The invention relates to an exercise device, in particular to a sports ankle exercise device. The sports ankle exercise device achieves the technical purposes that exercising can be better performed and the exercising efficiency can be improved. According to the technical embodiment, the sports ankle exercise device comprises a seat, a storage bag, armrests, an installing plate, a connecting block, a first spring, a sliding rod, a first sliding sleeve, a first stop block, a rotating plate, a supporting rod and the like; the left side face of the seat is provided with the storage bag capable ofstoring objects, the two sides of the front and back parts of the middle of the seat are each provided with one armrest, the installing plate is fixed to the lower portion of the right side face of the seat, the connecting block is arranged at the right part of the installing plate, and the sliding rod is fixedly arranged at the left side face of the connecting block. A sportsman moves the feet rightwards so that a swing mechanism can move rightwards, and therefore sportsmen of different heights can use the sports ankle exercise device for ankle exercising; the swing mechanism can better exercise the ankles, and therefore the ankles do not need to be exercised by hand, and the ankle exercising efficiency can be improved.