The invention discloses a biologic compound preparation capable of increasing weight and reducing feed conversion rate, for raising waterfowls. The biologic compound preparation is characterized by comprising the following components in percentage by mass of 50-55% of soluble glucose, 1-4% of enterococcus faecium, 0.5-2% of bacillus subtilis, 10-20% of bacillus coagulans, 3-10% of clostridium butyricum, 1-5% of adhesion factors, and 15-30% of composite immunoglobin for animals, wherein the enterococcus faecium, the bacillus subtilis, the bacillus coagulans, the clostridium butyricum and the adhesion factors are made into bacterium powder through performing coating treatment on bacterium fermentation liquor, and the viable count of the coated bacterium powder includes that the viable count of the enterococcus faecium is (1500-2500)*10<8>CFU/g, the viable count of the bacillus subtilis is (4500-5500)*10<8>CFU/g, the viable count of the bacillus coagulans is (30-50)*10<8>CFU/g, the viable count of the clostridium butyricum is (90-100)*10<8>CFU/g, and the viable count of the adhesion factors is (40-60)*10<8>CFU/g.