The utility model relates to a plane lock which comprises a lock base, a
handle and a lock cylinder device, a
handle groove is formed in the lock base, the
tail end of the
handle is locked through the lock cylinder device, and the lock cylinder device comprises a lock cylinder
assembly arranged at the position, close to the
tail end, of the handle and a lock catch part arranged on the lock base and matched with the lock cylinder
assembly in a locking / unlocking mode. A handle lifting handle is arranged at the
tail end of the handle in a pivoted mode, one end of the handle lifting handle can swing around the pivoted portion so as to be in a
closed state buckled on the handle and an open state tilted from the handle, the handle lifting handle is connected with an opening and closing control mechanism, and a lock cylinder of the lock cylinder
assembly is an operating end of the opening and closing control mechanism. The lock cylinder is operated to drive the handle lifting handle to be switched between the
closed state and the open state, the handle lifting handle is in the open state when the lock cylinder assembly and the lock catch part are in the unlocked state, and the handle lifting handle is in the
closed state when the lock cylinder assembly and the lock catch part are in the locked state. The lock has the advantages of being neat and attractive in appearance, good in prying-resistant performance and capable of indicating the lock state.