The invention relates to a bidirectional oil emulsion agent used in immunity agent, which comprises animal injection white oil, Siban 80, tuwen 80, stabilizer 1.2 propanediol, activator PVP polyvinyl pyrrolidon. And the production comprises that in room temperature, first emulsifying animal injection white oil in an emulsifying pot, to obtain light liquid wax oil, to be added with the lipophilic SIban-80, to be mixed for 3-7min at 75-80r/min speed until foam disappears and transparent, then mixing and adding hydrophilic tuwen-80 to be mixed for 3-7min uniformly, adding 1.2 propanediol, mixing uniformly, adding polyvinyl pyrrolidon until foam disappears and transparent, laying for 25-35min. The invention has low viscidity, injection support, uniform size, and adsorption support, with high stability, long service life, and the color in white or milky white with some pink.