The invention discloses an activity 
enhancer for shrimps, crabs and fish in 
aquaculture and a preparation method thereof. The 
enhancer comprises the following components in parts by weight: 15-20 parts of 
calcium gluconate, 25-35 parts of light 
calcium carbonate, 15-25 parts of 
calcium hydrophosphate, 20-30 parts of natural anti-
stress factor, 10-15 parts of 
amino acid and 5-10 parts of 
sodium percarbonate; and the natural anti-
stress factor comprises the following components in parts by weight: 13-18 parts of manyprickle acathopanax root, 12-15 parts of 
indigo woad root, 9-12 parts of 
baical skullcap root, 9-12 parts of 
cape jasmine fruit, 7-10 parts of artemtsm, 6-8 parts of Chinese angelica, 6-8 parts of raidx astragali, 4-7 parts of 
rheum officinale, 4-7 parts of campanumaea pilosula, 6-9 parts of 
salvia miltiorrhiza bunge, 5-7 parts of tree peony 
bark and 5-8 parts of 
uncaria. The preparation method comprises the following steps: adding the raw materials into a reaction kettle for stirring and mixing; heating the reaction kettle, standing and curing to obtain a finished product; and the natural anti-
stress factor is prepared by crushing the materials into 
powder. The invention provides an ecological preparation with high 
nutrition, no antibiotic and no harmful chemicals for shrimps, crabs and fish.