Head-up display device

The utility model relates to a head-up display device, comprising a connecting interface, a decoding element and a control element, wherein the connecting interface is used for electrically connecting to a controller area network bus of a vehicle; the decoding element is used for receiving state signals sent by the connecting interface and decoding all the state signals; and the control element is used for receiving the sent and decoded state signals of the decoding element and controlling a display control element and a voice element at the periphery. The controller area network bus (CAN Bus) of the vehicle is directly utilized to connect and read information and control system signals in the whole vehicle can be read by the simple connecting interface; and the state of the vehicle after being decoded can be projected on the head-up display device above the windscreen of the vehicle.