Clutch mechanism, posture adjusting assembly, vehicle-mounted screen device and vehicle

The embodiment of the utility model provides a clutch mechanism, a posture adjusting assembly, a vehicle-mounted screen device and a vehicle, the clutch mechanism comprises a first transmission part and a second transmission part, and the second transmission part is arranged on the periphery of the first transmission part in a sleeving mode; friction force exists between the first transmission piece and the second transmission piece so that separation and reunion of the first transmission piece and the second transmission piece can be achieved.