The invention relates to a power factor correction circuit (PFC). The power factor correction circuit comprises a main circuit and a drive circuit, wherein the main circuit comprises an inductance element, a first switch element and a diode; the inductance element comprises a primary winding; the primary winding is connected with the first switch element and the diode; when the first switch element is cut off, the primary winding releases stored energy through the diode; the inductance element also comprises a drive winding; and the drive circuit drives the first switch element according to an induced voltage signal generated by the drive winding, and controls the conduction time of the first switch element. A control chip of the PFC is replaced with a control line formed by a discrete component, so that the cost is reduced; meanwhile, the PFC circuit scheme is wide in application; and the power factor correction circuit not only can be applied to a boost-up circuit, but also can be applied to a step-down circuit and a plurality of boost-buck non-isolated circuit topologies.