The invention relates to an anti-coking turbine oil, which is composed of hydrorefined base oil, synthetic base oil, extreme pressure antiwear agent, antioxidant, pour point depressant, demulsifier, and antifoam agent. The oil refers to API II and III base oils, the synthetic base oil is propylene oxide polyalkylene ether, the extreme pressure antiwear agent is a composition of ashless composite additive and acid sulfide, and the antioxidant is A mixture of sulfide-based liquid high molecular weight phenol, alkyl diphenylamine or derivatives thereof, the pour point depressant is polyalphaolefin, the demulsifier is a polyether demulsifier, and the antifoaming agent is a composite antifoam Foaming agent; by weight percentage, each component is composed of hydrorefined base oil 70‑95%, synthetic base oil 0‑30%, extreme pressure antiwear agent 0.3‑1.5%, antioxidant 0.5‑2%, pour point depressant 0.1‑1%, demulsifier 0.01‑0.05%, antifoam agent 0.01‑0.04%. The invention has excellent anti-coking tendency, is not easy to form black paint film at high temperature, and has excellent heat and oxidation stability.