The invention relates to a vehicle-mounted display screen device and a vehicle. The vehicle-mounted display screen device comprises a display screen (17), a motor (2) and a transmission system, the motor drives the display screen to rotate through the transmission system, the transmission system comprises a first shaft (4), a second shaft (12), a first half clutch (10), a second half clutch (11) and an elastic part (9), the first shaft and the second shaft are coaxially arranged, the first half clutch can slidably sleeve the first shaft axially, the second half clutch is connected to the second shaft, first teeth are formed in the portion, facing the end face of the second half clutch, of the first half clutch, second teeth are formed in the portion, facing the second half clutch, of the first half clutch, and the elastic part applies axial elastic force to the first half clutch to make the first teeth meshed with the second teeth. By means of the vehicle-mounted display screen deviceand the vehicle, on one hand, switching of a cross screen and a vertical screen can be achieved; on the other hand, when the system is overloaded, power transmission can be timely interrupted, and themotor and the transmission system are prevented from being damaged.