Single-phase power factor correction circuit based on three-tube five-level topology, involving the field of power factor correction circuits, including switching tube Q 1 , Q 2 , Q 3 , the AC side of the AC power supply is connected to the diode D 1 anode, diode D 2 Cathode, its connection node constitutes terminal b; the other side of the AC power supply AC is connected to one end of the inductor L, and the other end of the inductor L is respectively connected to the diode D 3 anode, diode D 4 Cathode, connected to node to form terminal a; diode D 7 Cathode connection capacitance C 1 One end, the connecting node constitutes the terminal p; the capacitance C 1 The other end is connected to the capacitor C 2 One end, the connecting node constitutes the terminal n; the capacitor C 2 The other end is connected to the diode D 8 The anode, its connection node constitutes the terminal m; the switch tube Q 1 The drains are connected to the diode D 1 cathode, diode D 7 Anode, its connection node constitutes terminal c; switching tube Q 3 The source is connected to the diode D respectively 2 anode, diode D 8 Cathode, whose connection nodes form terminal d. The endpoints a, c, d, n form a symmetrical four-port. The correction circuit of the present invention adopts multi-level, and has the advantage of small voltage stress of the switch tube.