Boiler drain water energy-saving recycling device

The invention relates to the technical field of boilers, in particular to a boiler drainage energy-saving recycling device which comprises a box body, a filter cavity is formed in the box body, a communicated steam cavity is formed above the filter cavity, a first preheating cavity is formed in one side of the steam cavity, and the first preheating cavity communicates with the steam cavity through an air guide opening. A second preheating cavity communicated with the filtering cavity is formed below the filtering cavity, a filtering assembly is arranged in the filtering cavity, and an auxiliary assembly is arranged in the end, close to the filtering cavity, of the steam cavity; the filter assembly comprises an inclined filter screen, a rotating shaft is arranged below the inclined filter screen, convex blocks uniformly sleeve the rotating shaft, one end of the rotating shaft penetrates through the filter cavity and extends into the box body, a driven wheel is fixedly mounted on the outer wall of the rotating