An ankle-spinning exercise apparatus includes a casing unit, a power unit arranged in an interior of the casing unit, and a support unit drivable by the power unit to perform a rotation motion. A user may place an ankle on the support unit, and the power unit drives the support unit to perform rightward and leftward rotation motions, so that the entire lower limb (leg) of the user is driven to do a spinning like rotating motion, to thereby exercise the muscles and the meridian system of the entire lower limb of the user by which an effect of body building and heath care can be achieved.