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The present application relates to sewage treatment agent technical field, specifically relates to a kind of aluminum manganese composite coagulant and its preparation method and application.The preparation method provided by the present application includes the following steps: aluminum salt, manganese salt are dissolved, to obtain the solution containing aluminum salt and manganese salt;The solution containing aluminum salt and manganese salt, first mixing of alkaline solution, to obtain first mixed liquor;The first mixed liquor, sodium silicate solution and polyacrylamide solution are second mixed, and the second mixed liquor obtained is cured to obtain aluminum manganese composite coagulant.The aluminum manganese composite coagulant obtained by the preparation method of the present application has a more extensive pH adaptation range, improves the ability to remove natural organic matter, and can also reduce the color problem caused by manganese residue.Moreover, it is extremely easy to flocculate and settle during water treatment, which can reduce chemical residues.