A microwave motion sensor has a circuit assembly for intrusion detection in a predetermined space. The microwave motion sensor comprising a control unit, a microwave sensing unit and a microwave confining unit. The microwave sensing unit, for transmitting and receiving a microwave signal, is separated in structure but electrically coupled to the control unit. The microwave confining unit, for managing a detection zone of the microwave signal, has an accommodating space formed inside the microwave confining unit, and the microwave sensing unit being disposed inside the accommodating space. Wherein the circuit assembly is divided into the control unit and the microwave sensing unit, the scope of the detection zone of the microwave signal varies based on the shape of the microwave confining unit and the shape of the microwave confining unit varies based on the predetermined space.
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