Lock

The utility model discloses a lock which comprises a lock body, a lock knob rotatably arranged on the lock body, a dead bolt disposed on one side of the lock knob and a torsion spring. The lock knob is of a cam structure, one side of the dead bolt is provided with a bayonet connected with the extending end of the cam structure in a clamped mode, and the dead bolt moves up and down along with swing of the lock knob; the lock body is further provided with a limiting part, one end of the torsion spring is fixed to the lock knob, the other end of the torsion spring is fixed to the limiting part, and the dead bolt is provided with a clip-shaped hole which slides along the limiting part. The structural strength of the lock knob is increased due to the cam structure, the dead bolt can be conveniently driven to move up and down to be opened and closed, the inside structure of the lock is relatively simple, the number of parts is small, the lock is convenient to open, and use cost is effectively reduced.