Metal door and window with self-locking function

The utility model discloses a metal door and window with a self-locking function, and relates to the technical field of building doors and windows, the metal door and window comprises an outer frame and a metal door and window main body, the outer surface of the metal door and window main body is movably connected with the outer surface of the outer frame, a self-locking mechanism is arranged between the outer frame and the metal door and window main body, a dust removal mechanism is arranged in the outer frame, and the dust removal mechanism is connected with the metal door and window main body. And the self-locking mechanism comprises a lock catch. Through the cooperation of the lock catch, the clamping groove, the first clamping block, the telescopic rod, the first spring, the second clamping block, the second spring and the pull rod, when the metal door and window body is pulled to abut against the outer frame, the lock catch extrudes the first clamping block and the second clamping block, so that the fir