The invention relates to a simple, wireless, all-in-one and high-definition display device and a control method thereof. The device comprises a transmission end and a display end, wherein the transmission end comprises an identification and transmission circuit which comprises an HDMI (high-definition multimedia interface) circuit, a first micro-control processing circuit, a first encoding module, a power amplification module, a first wireless transmission module and a first power supply module; and the display end comprises a second wireless transmission module, a decoding module, a second micro-control processing circuit, a second encoding module, a display module CPU, a display module and a second power circuit. The method comprises steps as follows: a user accesses the transmission end to video output equipment and matches the transmission end with the display end in current environment, and real-time display of a screen display output signal of the video output equipment at the display end is finished after selected connection by the user. The simple, wireless, all-in-one and high-definition display device and the control method are very simple to operate, the access type of access equipment is expanded, and better use experience is provided for the user.