The invention discloses small-sized automatic flue gas denitration equipment which comprises a flue gas pipeline and a smoke inlet chamber formed in the flue gas pipeline, wherein a reaction box is fixedly arranged at the right end of the flue gas pipeline; a denitration chamber is formed in the reaction box; one end of the smoke inlet chamber is in communication with the denitration chamber, andthe other end of the smoke inlet chamber is in communication with a combustion chamber; a filter element is arranged in the smoke inlet chamber; a boosting pump is arranged in the smoke inlet chamber;a check valve is arranged in the smoke inlet chamber; flue gas enters the smoke inlet chamber and is filtered by the filter element, and the filter element filters particulate matter in the flue gas;the equipment is suitable for use in rural households, and regular denitration treatment can be carried out on the discharged smoke, so that the number of treatment is reduced, the treatment processis completely automated, at the same time, when denitration is carried out by the device, the reaction environment is low in temperature and high in pressure, the denitration efficiency is greatly improved, and the denitration cost is reduced.