The invention provides an arc-suppression circuit of an alternating-current contactor and a control method thereof, which are used for arc-suppression of alternating-current contactors, various relays and switch appliances. The arc-suppression circuit of the alternating-current contactor comprises a main switch K1 and a controllable double-end circuit A. The arc-suppression circuit of the alternating-current contactor is characterized in that the main switch K1 is a mechanical type switch, and the controllable double-end circuit A comprises a controllable double-end circuit A, a first voltage end and a second voltage end, wherein the first voltage end and the first electrode end P1 of the main switch are at the same end, and the second voltage end and the second electrode end P2 of the main switch are at the same end; the invention better solves the technical problem of severe fire striking and arc pulling phenomena which are difficult to solve in the structure of the prior similar product, and the control method is advanced. The invention has the advantages of no arc pulling, large current-carrying capacity, low cost, long service life, small volume, convenient installation, use and replacement and extensive application range, thereby being suitable for generalization, popularization and use in the field of electric appliances.