The invention discloses special compound fertilizer containing LMW (low molecular weight) polyglutamic acid for strawberries and a preparation method of the special compound fertilizer. According to the method, the special compound fertilizer is prepared from LMW polyglutamic acid fermentation broth, urea, potassium sulfate, calcium hydrogen phosphate, ammonium hydrogen carbonate, magnesium sulfate, borax, zinc sulfate, manganese sulfate, ammonium molybdate, distillers' grains, plant ash and animal waste, and organic fertilizer is prepared from LMW polyglutamic acid cheated medium trace elements, the distillers' grains, the plant ash and the animal waste. The special compound fertilizer for the strawberries is rich in polyglutamic acid, trace elements and organic fertilizer, so that nutriment supply of the strawberry growing process is guaranteed, furthermore, the fertilizer has slow release feature, so that soil fertility can be improved, strawberry yield is greatly increased, meanwhile, the utilization rate of the fertilizer is increased, and the production cost is reduced.