NOVELTY - Preparing multi-element complex microbial fertilizer, comprises culturing four microbial strains in liquid culture medium, mixing the strain cultures according to vol.%: 30 vol.% phosphate-solubilizing bacteria (Bacillus megaterium CGMCC No.4296), 30 vol.% nitrogen-fixing bacteria (Azotobacter beijerinckii DSM No.373), 20 vol.% indole-3-acetic acid (IAA) producing bacteria (Paenibacillus polymyxa CGMCC No.3044) and 20 vol.% antagonistic pathogen (Paracoccus sphaerophysae ACCC 05413T), adding complex strains into e.g. IAA producing medium, and mixing.    USE - The method is useful for preparing multi-element complex microbial fertilizer.    ADVANTAGE - The fertilizer can supplement plant rhizosphere in addition to nitrogen, phosphorus and IAA so as to achieve high growth promotion and disease prevention efficacy.    DETAILED DESCRIPTION - Preparing multi-element complex microbial fertilizer, comprises culturing four kinds of microbial strains for 24 hours in a liquid culture medium until the viable cell number reaches to 109, mixing the cultured strain cultures according to the following vol.%: 30 vol.% phosphate-solubilizing bacteria (Bacillus megaterium CGMCC No.4296), 30 vol.% nitrogen-fixing bacteria (Azotobacter beijerinckii DSM No.373), 20 vol.% indole-3-acetic acid (IAA) producing bacteria (Paenibacillus polymyxa CGMCC No.3044) and 20 vol.% antagonistic pathogen (Paracoccus sphaerophysae ACCC 05413T), after mixing the mixed solution, respectively adding the complex strains into 5% IAA producing culture medium, 5% Pikovskaya's culture medium of phosphate-solubilizing bacteria, 5% Ashby culture medium of nitrogen-fixing bacteria and 5% potato dextrose agar (PDA) culture medium of antagonistic pathogen according to percentage ratio of the mixed total volume, and mixing until the viable count is greater than or equal to 2x 109, where the optimal temperature for production is 26-28 degrees C and the pH is 7-7.2. An INDEPENDENT CLAIM is also included for the multi-element complex microbial fertilizer, prepared by the method as mentioned above.