Large-flow rotary water filter

The utility model belongs to the field of engines, and particularly relates to a large-flow rotary water filter which comprises a shell, a sealing cover, a fixing plate and a reagent adding structure. A sealing cover is mounted at the top of the shell, a fixing plate is mounted in the shell in a sliding manner, and a plurality of reagent adding structures are mounted on the top surface of the fixing plate; the reagent adding structure comprises an inner threaded sleeve, an adding pipe, DCA4 pills and a pressing cap; a plurality of internal thread sleeves are fixedly connected to the top surface of the fixing plate in a surrounding manner, an adding pipe is mounted in the internal thread sleeves in a threaded manner, a plurality of through holes are formed in the outer ring of the adding pipe, a plurality of DCA4 pills are slidably mounted in the adding pipe, and a pressing cap is mounted on the outer ring of the top of the adding pipe in a threaded manner; dCA4 pills can form a protective film on the surface