Heat-resisting lyophilized protecting agent of live vaccine for animal and preparation method thereof

The invention provides a heat-resistant freeze-drying protective agent applied to animal freeze-dried live vaccine. The heat-resistant freeze-drying protective agent comprises 1%-3% of glutin, 1%-8% of lactose and the like, wherein, all substances are dry components, and distilled water takes all the rest percentage. The invention also provides a method for preparing the protective agent. ND live vaccine prepared by the protective agent of the invention can be conserved for more than 24 months at the temperature of 2 DEG C to 8 DEG C. Immunity test shows that the average antibody level of immunized chicken is 1 to 2 titers higher than the average antibody level of tested chicken immunized by the ND live vaccine which is freeze-dried by ordinary protective agent, and the antibody level is uniform. Therefore, the freeze-drying protective agent can be widely applied to the production and conservation of various animal live vaccines and has wide application prospect.