The present invention controls a phase by using a high-frequency transformer to a transmitter output stage of a wireless power transmission device composed of a power semiconductor to connect a plurality of inverters in parallel in order to operate. The wireless power transmission device according to the present invention comprises an AC/DC rectifier for rectifying an input power; a DC/DC converter for adjusting the power rectified by the AC/DC rectifier on power which is suitable for transmitting the wireless power transmission device; and two or more DC/DC inverters connected to the DC/DC converter and to perform the high-frequency power conversion, wherein the DC/DC inverters are connected in parallel.
