The utility model belongs to the field of sewage treatment, and particularly relates to an anaerobic system for anti-scaling landfill leachate. The device comprises an anaerobic tank, a circulating system and an interferon dosing tank, wherein an exhaust chamber and a separator are arranged in the anaerobic tank main body, the circulating system is connected with the anaerobic tank, a filler areais also arranged above the tank body, and a sludge discharge pipe is arranged at the bottom of the tank body; the circulating system sequentially comprises a buffer, a circulating pump and a mixer from the circulating outlet; and the buffer is connected with an interferon dosing box. By additionally arranging the interferon adding device and fully mixing interferon and leachate inside and outsidethe anaerobic tank, the effect of interferon is fully exerted, and the investment of interferon is reduced while the anti-scaling effect is ensured; the anaerobic tank is modified, and the water distributor, the vertical baffle plate and the sludge buffer plate are arranged, so that the circulation load is effectively reduced, the consumption is reduced, and the energy is saved while the reactionof the anaerobic tank is ensured.