NOVELTY - Preparing chitin activated calcium fertilizer, comprises cleaning ocean shellfish waste, sterilizing, drying, and crushing into powder of 100-120 meshes powder, stacking to ferment in workshop, sterilizing by distillation sterilizing for 4-5 days, adding soybean meal in crushed ocean shellfish waste, stirring uniformly, mixing according to weight ratio the ocean shellfish waste and soybean meal uniformly, adding fermentation liquid for fermentation, where the moisture content in fermentation is controlled at 40-50%, during fermentation, turning once for every 7-10 days, and packing.    USE - The method is useful for preparing chitin activated calcium fertilizer (claimed).    ADVANTAGE - The method solves the shell waste problem occurring in coastal shellfish cultivation by utilizing the shellfish waste in the preparation process, and increases the cultivation benefit of shellfish product. The fertilizer has strong bactericidal effect, improves soil, strengthens the immunity and increases fertilizer effect.    DETAILED DESCRIPTION - Preparing chitin activated calcium fertilizer, using material composed of 80-120 pts. wt. ocean shellfish waste, 8-12 pts. wt. soybean meal, and 8-12 pts. wt. fermented liquid, where the fermentation liquid is prepared by mixing more than 200 million per gram of anaerobic complex microbial powder and water according to ratio of 1:8-10, stirring, the anaerobic complex microbial powder is obtained by mixing nitrogen-fixing bacteria, lactic acid bacteria, Bacillus and fungi, fermentation culturing to obtain mixed powder, comprises (i) cleaning ocean shellfish waste, sterilizing, drying, and crushing into powder of 100-120 meshes powder, stacking to ferment in workshop, sterilizing by distillation sterilizing for 4-5 days, (ii) adding soybean meal in crushed ocean shellfish waste, stirring uniformly, (iii) mixing according to weight ratio the ocean shellfish waste and soybean meal uniformly, adding fermentation liquid for fermentation, where the moisture content in fermentation is controlled at 40-50%, during fermentation, uniformly turning once for every 7-10 days, where the fermentation time is 55-65 days, the fermentation temperature is 50-60 degrees C, and (iv) packing.