The utility model relates to a synchronous nitrification and denitrification sewage treatment tank. The sewage treatment device comprises a tank body, a sewage conveying pipe and jet aeration equipment, the jet aeration equipment comprises a submersible sewage pump, a jet aerator and a connecting pipeline; the submersible sewage pump is communicated with the jet aerator through the connecting pipeline; wherein the plurality of jet aerators are uniformly arranged in the tank body at intervals, a circular area within a certain radius around each jet aerator is an aerobic area formed by aeration,a central anoxic area is formed between the two aerobic areas, and the water outlet end of the sewage conveying pipe is positioned in the central anoxic area; the technical problems of long time of asewage treatment reaction process and large occupied area of a reaction tank in the prior art are solved.