The invention discloses Wuxing spleen-tonifying decomposed porridge. The Wuxing spleen-tonifying decomposed porridge is prepared by performing mixed fermentation on a fermentation extracting solutionand solid fermentation materials and then performing mixing with seasoning materials, wherein the fermentation extracting solution is prepared from the following raw materials: celery roots, dried tangerine peel, semen raphani, white radish roots, sedum aizoon, rhezoma lycopi, glossy privet fruits, solomonseal rhizome, Chinese cabbages, licorice roots, wolfberry fruits, bananas, Chinese floweringcrabapples, honey, rice wine koji, water and corn; the solid fermentation materials comprise the following raw materials: astragalus roots, millet, Chinese yams, white hyacinth beans, tuckahoe, corn,soybeans, lotus seeds, rice, Huai wheat, coix seeds and saccharomycete; and the seasoning materials comprise the following raw materials: soybeans and Chinese yams. The invention also discloses a preparation method of the Wuxing spleen-tonifying decomposed porridge. The Wuxing spleen-tonifying decomposed porridge is prepared by low-temperature fermentation, extraction and decomposition, contains various trace elements required by a human body, is convenient to absorb by the human body, and has the effects of strengthening the spleen, helping digestion, tonifying deficiency, eliminating dampness and the like.