The present invention relates to a microwave sensing antenna module which comprises a substrate, an oscillator, and a detection mixer. The substrate has a first side face. The oscillator is arranged on the first side face. The detection mixer is arranged on the first side face and has a detection mixing circuit structure and at least one detection element arranged on the detection mixing circuit structure. The detection mixing circuit structure comprises multiple structure sections, and each structure section has a bent part. The structure sections of the detection mixing circuit structure are mutually connected, the bending directions of the bent parts are corresponding to each other to get close or retract, and thus the area occupied by the circuit layout is greatly reduced. While the effective microwave sensing is ensured, the overall size can be reduced.