Detection assembly, man-machine interaction device and mobile platform

A detection assembly, a man-machine interaction device and a mobile platform are used for being arranged on the mobile platform, the detection assembly comprises a rotating shaft and a detection mechanism, and the rotating shaft is provided with a containing cavity and is suitable for being rotationally connected with the mobile platform; the detection mechanism is contained in the containing cavity and used for detecting information of a cabin of the mobile platform. The rotating shaft and the detection mechanism are arranged, the detection mechanism is contained in the containing cavity formed in the rotating shaft, the rotating shaft rotates to enable the detection mechanism to detect external information, the detection assembly is not exposed out of the cabin, and the user experience can be improved.