The invention discloses phytic acid silane protection type emulsive cutting fluid added with modified chitosan oligosaccharide surface active agent. The emulsive cutting fluid is prepared from, by weight, 50-54 parts of polyol ester, 18-19 parts of lauryl diethanol amide, 3-3.3 parts of boric acid, 0.7-0.8 part of p-toluenesulfonic acid, an appropriate amount of petroleum ether, 0.4-0.5 part of methyl triethoxysilane, 5-5.5 parts of phytic acid, an appropriate amount of deionized water, an appropriate amount of absolute ethyl alcohol, 0.2-0.25 part of sodium bromate, 30-34 parts of castor oil polyoxyethylene aliphatate, 8-8.5 parts of petroleum sodium sulfonate, 3-4 parts of sorbitan monooleate, 1-1.5 parts of sodium oleate, 10-11.5 parts of dehydroabietic acid glycidyl ester, 2-2.2 parts of chitosan oligosaccharide, 10-11 parts of 1-Methyl-2-pyrrolidinone and an appropriate amount of acetone. The phytic acid silane protection type emulsive cutting fluid added with the modified chitosan oligosaccharide surface active agent is a waterborne formula, and the lubricating cooling performance is good; meanwhile, in the metal cutting machining process, a layer of protective film can be formed at the surface of metal, and the corrosion inhibition efficiency is high.