Abstract: A surge absorption circuit for a single-phase air conditioning system, including: an L line and an N line, where one end of each of the two is connected to a power source, and the other end of each is connected to one pin of a rectifier bridge; a common mode inductor, which includes a magnetic ring, and first and second common mode coils that are connected in series in the L line and the N line, respectively; a first surge absorption unit, which is connected to the side of the common mode inductor close to the power source and which comprises first and second varistors and a first discharge tube, where one end of each of the first and second varistors is connected to the L line and the N line respectively, and the other end of each is connected to each other and grounded by the first discharge tube.