A-B key blade lock

The utility model discloses an A-B key blade lock. The lock comprises a lock body. The lock body is provided with a up-down pull bar sheet, a latch bolt assembly, a latch bolt dialing piece, a handle dialing piece, an insurance bolt assembly, a turn button and a main bolt slide plate. The main bolt slide plate is provided with blades and a spring. The side surface of the blade is provided with a spacing sheet. The spacing sheet is provided with an elastic element. The spacing sheet enables a spacing function on one blade among the blades. When one end of the spacing sheet is snapped into an aperture of the blade, the blade is spaced. When a B key is inserted into the lock body, the B key can push aside other blades apart from the spaced blade and push aside the main bolt slide plate to unlock the lock. When an A key is inserted in to the lock body to rotate a circle, the A key pushes aside the spacing sheet and the main bolt slide plate to unlock the lock. Since the spaced blade is recovered to normally opera