Composition for anti-ammonia turbine oil

The invention relates to a composition for anti-ammonia turbine oil. The composition comprises the following components by weight percentage: 1.1-2.0% of screening phenol antioxygen, alkyl diphenylamine antioxygen or formulated mixture antioxygen thereof, 0.01-2.0% of non-acid antirusting agent, 0.01-1% of metal passivator, 0.001-0.01% of anti-foaming agent and the balance of base oil. The base oil is II type hydrogenated base oil, and in the II type hydrogenated base oil, the sulphur content of the II type hydrogenated base oil based on weight is no more than 0.03%, and the saturation is no less than 90%. The antioxygen is formulated by the screening phenol antioxygen and the alkyl diphenylamine antioxygen, and the weight proportion of the antioxygen 1:0.1-10. The invention has the advantages of excellent lubricity, oxidation stability, favorable water separation, air release property and strong anticorrosion property, maintains neutral for ammonia and synthesis gas, has little possibility of sludge generation, reduces the time of machine halt, andreduces operation and maintenance cost.