The invention relates to offshore structures, in particular to an anti-theft type aluminum alloy house based on an offshore platform. The anti-theft type aluminum alloy house comprises a house body which is of an aluminum alloy structure and is provided with a window and arranged on a platform deck, the window is provided with an internal window sash and an external window sash, wherein the internal window sash is provided with a smooth rabbet, and the external window sash is provided with a hooked rabbet; and the upper end of the smooth rabbet is provided with an internal sash part anti-theft safe limiting piece which is connected through an internal sash part safe limiting connecting screw, the head part of the internal sash part safe limiting connecting screw is located at the intersection part of an internal sash part, the upper end of the hooked rabbet is provided with an external sash part anti-theft safe limiting piece which is connected through an external sash part safe limiting connecting screw, and the head part of the external sash part safe limiting connecting screw is located at the intersection part of an external sash part. The anti-theft type aluminum alloy house has the advantages that the house cannot be dismounted from outside when the house is closed and locked, and the corrosion resistance is good, and the problems that a sliding window anti-theft structure of a house on an existing offshore platform can be dismounted from outside when a window is closed and locked, and thus the anti-theft limiting effect is poor and the corrosion resistance is poor are solved.