NOVELTY - Composite microbial fertilizer comprises microbial fermentation bacteria liquid and composite nutrient. The fermentation culture medium of microbial fermentation bacteria liquid is added with 2-6% Enteromorpha. The microbial fermentation bacteria liquid comprises Bacillus thuringiensis, B. megaterium and B. amyloliquefaciens. The composite nutrient includes nitrogen, phosphorus and potassium elements, trace elements and amino acid complex. The trace elements comprise calcium, magnesium, zinc, manganese, boron, iron and copper.    USE - Composite microbial fertilizer used for soil fertilization (claimed) for promoting the growth of crops.    ADVANTAGE - The composite microbial fertilizer contains organic-inorganic composite nutrients, all kinds of active microorganisms and Enteromorpha and improves soil fertility, crop growth environment and crop yield.    DETAILED DESCRIPTION - Composite microbial fertilizer comprises microbial fermentation bacteria liquid and composite nutrient. The fermentation culture medium of microbial fermentation bacteria liquid is added with 2-6% Enteromorpha. The microbial fermentation bacteria liquid comprises B. thuringiensis, B. megaterium and B. amyloliquefaciens at 1:1:0.2 volume ratio. The composite nutrient includes nitrogen, phosphorus and potassium elements, trace elements and amino acid complex. The trace elements comprise calcium, magnesium, zinc, manganese, boron, iron and copper, which are added in the form of soluble compound. An INDEPENDENT CLAIM is included for preparation of composite microbial fertilizer comprising activating the inclined plane preserved strain of B. thuringiensis, B. megaterium and B. amyloliquefaciens at 4 degrees C, inoculating to Luria Bertani solid plate culture medium, culturing at 37 degrees C for 24 hours, inoculating in liquid fermentation culture medium, culturing at 37 degrees C and 200 revolutions/minute (rpm) for 16-17 hours, collecting the fermentation culture liquid, where fermentation culture medium comprises 2-6 mass% Enteromorpha, 1 mass% glucose, 0.6 mass% dipotassium hydrogen phosphate trihydrate, 0.3 mass% monopotassium phosphate, 0.15 mass% urea, 0.5 mass% yeast powder, 0.41 mass% magnesium sulfate heptahydrate and balance water, adding diatomaceous earth to fermentation culture liquid, adding composite nutrient, uniformly mixing, filling into plastic bottle, UV disinfecting, pasting product label, and obtaining the product.