Immune enhancer for pig vaccine, and preparation method and application thereof

The invention provides an immune enhancer for pig vaccine, and a preparation method and application thereof. The immune enhancer for pig vaccine comprises a pig gene engineering cell factor compound and a freeze-drying protective additive, wherein the pig gene engineering cell factor compound comprises the following ingredients in parts by weight: 50 to 70 parts of recombinant porcine IFN-Alpha, 15 to 25 parts of recombinant porcine IFN-Gamma and 15 to 25 parts of recombinant porcine IL-2. The immune enhancer has the following effects that after the combined use of the immune enhancer and the vaccine, the vaccine protective period specificity antibody level is improved; the antibody generating window period is shortened by 30 to 50 percent; the secretory volume of specific humoral immunity response markers 1L-4 can be improved by 1 to 5 times through being compared with that during the single use of the vaccine; the cellullar immunologic response level of the pig vaccine can be improved; the secretory volume of the cellullar immunologic response marker interferon Gamma is improved by 1 to 5 times through being compared with that during the single use of the vaccine; the safety is high; the immune enhancer can be prepared into a water soluble state; the problems that on the existing market, the vaccine immunologic adjuvant has the injection abscess, nodule and ulceration, so that the acute or chronic inflammation reaction and the like can be caused are solved.