Locking tool

A locking tool comprises a bottom plate, a fixing seat, a clamping assembly and a locking assembly, and a locking hole is formed in the bottom plate; the fixed seat is fixed on the bottom plate; the clamping assembly is connected with the fixing base and can move relative to the fixing base so as to be used for clamping a workpiece. The locking assembly comprises a lock seat, a lock cylinder, an unlocking block and a first elastic piece, the lock seat is connected with the clamping assembly, the lock cylinder is arranged in the lock seat and used for stretching into the locking hole to lock the lock seat, the unlocking block is used for pushing the lock cylinder to retreat from the locking hole to unlock the lock seat, the lock seat is used for pushing the clamping assembly to move, and the first elastic piece elastically abuts against the fixing seat and the unlocking block. The first elastic piece pushes the unlocking block to return so that the lock cylinder can stretch into the locking hole again, and the