Disclosed in the present invention are a control method and device for a power factor correction circuit. The method comprises: obtaining voltage information of the power factor correction circuit; determining whether the voltage information meets a set switching condition; if the set switching condition is met, switching a control mode of the power factor correction circuit to a continuous conduction mode; and if the set switching condition is not met, switching the control mode of the power factor correction circuit to a triangular wave current mode or a critical conduction mode. Compared with the prior art, the control mode of the power factor correction circuit can be different according to the voltage information in the embodiment of the present invention, instead of remaining unchanged at all times, without increasing the withstand voltage level of the bus capacitor, thereby reducing the cost of implementation. Moreover, it is not necessary to forcibly change a given value of the current peak, thereby improving the total harmonic distortion of the input current. (FIG. 1)