The embodiment of the invention provides a rectifying circuit and relates to the field of electrical power units. The rectifying circuit can increase the circuit usage rate to reduce the cost. The rectifying circuit comprises four input rectifiers, four voltage converters which are connected in parallel, a first capacitor and a second capacitor, wherein each of the input rectifiers is connected with one of the voltage converters and comprises two phase voltage input terminals, a positive phase voltage output terminal and a negative phase voltage output terminal; the positive phase voltage output terminals of the rectifiers are connected with positive voltage input terminals of the voltage converters; the negative phase voltage output terminals of the rectifiers are connected with the negative voltage input terminals of the voltage converters; the positive voltage output terminal of each voltage converter is connected with the first electrode of the first capacitor; the negative voltage output terminal of each voltage converter is connected with the second electrode of the second capacitor; a common terminal of each voltage converter is connected with the second electrode of the first capacitor and the first electrode of the first capacitor. The embodiment of the invention is applicable to the rectifying circuit.