In view of the low power factor of traditional LED drive power, introduces a novel single-stage PFC converter which combined a PFC stage and a two-transistor forward DC/DC converter into one stage with shared input switch and the freewheeling diode. Under the same controller circuit, it has the function of Boost PFC and conforms to the two-transistor forward topological structure, greatly simplifying the circuit structure. The detected result for the experimental prototype shows that the converter achieves high input power factor and high converting efficiency with advantages of simple structure, easy operation and less cost, and is suitable for small and medium power LED driver.