The invention relates to a phase-shift full-bridge zero-voltage switch converter. The main circuit of the converter comprises an input direct-current power supply, a full-bridge inverter circuit, a transformer, an uncontrolled rectifier circuit and a filter output circuit. The switch converter is characterized in that an active clamping circuit of a transformer primary side is arranged in the full-bridge inverter circuit and includes two clamping switching tubes (Q5 and Q6) and a resonant capacitor or a power resistor. In the full-bridge circuit, the two clamping switching tubes (Q5 and Q6) forms a new pair of bridge arms; and the connection point between the two clamping switching tubes (Q5 and Q6) is connected between the transformer primary side and an inductor (Lr) of the full-bridge inverter circuit by the resonant capacitor or power resistor. According to the invention, in the full-bridge inverter circuit of the primary side of the transformer, a new circuit topology is formed by the clamping switching tubes, so that the defects of a secondary side clamping circuit can be overcome and problems that the existing primary side clamping conduction loss is high and the conduction efficiency can not be effectively improved can be solved.