An adjustable skate includes a boot, a liner, and an adjusting device. The boot includes a toe cap, a heel portion, and a sole. The liner is mounted in the boot and includes a bottom plate and a toe box. A chamber is defined between the toe box and the heel portion of the boot for receiving a foot of a wearer. The adjusting device is mounted below the sole and includes a screw rod and a screw rod jacket. The screw rod jacket includes a longitudinal screw hole threadedly engaged with a threaded portion of the screw rod. The screw rod jacket is fixed below the liner to move therewith. When the screw rod is turned, the screw rod jacket moves in a longitudinal direction of the screw rod and the liner moves in a lengthwise direction of the chamber.