The invention relates to a preparation method of astaxanthin life liquid for sows. The astaxanthin life liquid is prepared from the following raw materials in percentage by weight: 0.6-1.3% of L-tryptophan, 1.2-2.2% of L-ascorbic acid-6-palmitate, 1-2% of light calcium carbonate, 1.6-2.6% of animal bifidobacteria, 1.1-2.1% of sodium tripolyphosphate, 1.8-2.8% of a silybum marianum extract, 1.9-2.9% of thiobacillus thiooxidans, 0.2-1.1% of calcium sulfate, 0.5-1% of menadione dimethylpyrimidinol bisulfite, 0.7-1.7% of bacillus lentus, 0.1-1.1% of manganese carbonate, 1.2-2.2% of a snake gall extract, 2.6-3.6% of a perilla seed extract, 2-3% of lemon yellow, 1.9-2.9% of acacia gum, 1.5-2.5% of vitamin B1, 1.6-2.6% of zinc propionate, 1.3-2.3% of sea buckthorn fruit oil, 2.8-3.8% of probiotics, 1.8-2.8% of astaxanthin and 53.5-73.6% of water. The astaxanthin life liquid has good effects of accelerating growth hormone secretion, accelerating growth and development of replacement sows, accelerating nidation of fertilized eggs and development of fetuses of pregnant sows, accelerating milk secretion yield of lactation sows, improving milk quality, enabling the milk secretion yield to reach peak of milk secretion as soon as possible after parturition and obviously improving fertilization rate during oestrus period, litter size, birth weight of piglets and weaning weight of piglets.