The invention discloses a zero voltage switch full bridge DC converter based on a pi-type auxiliary network, comprising a DC power supply, a first inverter bridge arm and a second inverter bridge arm, a first/second auxiliary inductor, an auxiliary capacitor, an insulation transformer and a rectification filter circuit. The invention adopts a phase-shift control mode, as the auxiliary network composed of the auxiliary capacitor and the insulation transformer is added, zero voltage switching of a switch tube can be realized within the range of full load, and meanwhile secondary side voltage peak and oscillation can be well controlled.