An embodiment of the present invention provides a high frequency transformer, The high frequency transformer comprises: core, primary winding and secondary winding, the iron core is an integral triangular equilateral structure, The primary winding and the secondary winding are uniformly wound around the three sides of the iron core, and the three-phase magnetic circuit of the primary winding is symmetrical, thus avoiding the loss caused by the transmission of the fundamental component of the primary side to the secondary side of the high-frequency transformer, and because only one transformeris adopted, the loss of the high-frequency transformer is small, the wiring is simple and the volume is small.