NOVELTY - Poly-element composite microbial fertilizer preparation involves mixing powder of vinasse, fungal residues, rice hull, slurry carbon, wheat hull, bagasse, saw dust and plant ash uniformly, and then sieving the mixture by 0.1-0.2cm sieve to obtain sample A. Chroococcus, Eunotia lunaris, Chlamydomonas sajao, Anabaena azotica and Chlorella vulgaris are fermented and then the obtained fermented algae liquid is absorbed by sample A with 3-12 times of weight. All algae agents are uniformly mixed in ratio of 5-55:0-30:0-35:0-35:10-50 to obtain sample B.    USE - Method for preparing poly-element composite microbial fertilizer (claimed) used for preventing physiological disease caused due to lack of boron in plants.    ADVANTAGE - The method enables to prepare poly-element composite microbial fertilizer that can increase supply of effective nutrient of soil, improve physical character of soil, promote growth of plant and increase yield and quality of crops.    DETAILED DESCRIPTION - Poly-element composite microbial fertilizer preparation involves mixing powder of vinasse, fungal residues, rice hull, slurry carbon, wheat hull, bagasse, saw dust and plant ash uniformly, and then sieving the mixture by 0.1-0.2cm sieve to obtain sample A. Chroococcus, Eunotia lunaris, Chlamydomonas sajao, Anabaena azotica and Chlorella vulgaris are fermented and then the obtained fermented algae liquid is absorbed by sample A with 3-12 times of weight. All algae agents are uniformly mixed in a ratio of 5-55:0-30:0-35:0-35:10-50 to obtain sample B. Powder of slurry carbon, lignite, montmorillonite, zeolite, bentonite, vermiculite and fly ash are mixed and then sieved through 0.1-2cm sieve to obtain sample C. Bacillus megaterium, Rhodopseudomonas palustris, Bacillus subtilis, Streptomyces jingyangensis and Bacillus mucilaginosus are fermented and then obtained fermented algae liquid is absorbed by sample C in a ratio of 10-50:0-30:0-35:0-25:10-55 to obtain sample D, where 5-25wt.% of diethanolamine, glycol amine and diglycolamine are added in a reaction kettle, and 15-35wt.% of water is added to the kettle to dissolve the components. 0.1-3.5wt.% of zinc acetate, manganese nitrate and cobalt sulfate are added to the kettle and reaction is performed at 30-70 degrees C for 0.5-2.5 hours with agitating the mixture uniformly. 0-20wt.% of ethanolamine, 30-65wt.% of Borax (RTM: Boric acid) or/and boric acid are added to the mixture and then complexation reaction is performed at 65-110 degrees C for 2-8 hours to obtain a composition as sample E. The final product is obtained by mixing 15-50wt.% of sample B, 35-70wt.% of sample D, 5-15wt.% of sample E and 0-10wt.% of livestock manure.