Even if explosion occurs in a cooking chamber, the door-locking system for a micro-wave oven is arranged to prevent one from being isolated to main body with a main body by providing a fixing force for firmly fixing door. A door-locking system for a micro-wave oven includes a hollow shaft (110), a Coupling device (120) and a driving motor (130). Axis is arranged horizontally in a computer room (42), when rotating forward or backwards. Coupling device is mounted on the another side of one (50). If rotation before axial, Coupling device is inserted into axis and repairs the front surface that door is fixed to a main body (40). If axis rotation is reversed, Coupling device is isolated to issue a stationary state of door with axis. Driving motor is coupled with axis with selectively rotary shaft.
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