The invention discloses a manure-production corrosion-catalyzing composite fungicide, and a preparation method and application thereof. The manure-production corrosion-catalyzing composite fungicide is prepared by culturing strains such as rhizobium fredii, bacillus fluorescens, bacillus cereus, bacillus mucilaginosus, bacillus subtilis, paecilomyces lilacinus, trichoderma harzianum and the like by virtue of a solid-liquid two-phase manner, adjusting a viable count and then mixing; and the decomposition of straws can be facilitated for use, soil hardening and acidifying phenomena are relieved, the loss of fertilizer constituents can be prevented, the ecological environment is protected, fertilizer is saved, a pesticide is saved, the cultivation cost of crops is decreased, the vigorous growth of the crops is ensured, and production increase and good harvest are realized.