The invention discloses a formula of environmental friendly type long-term automobile coolant and a process for preparation, the formulation contains glycol, desalting water, decanedioic acid, sodium benzoate, sodium molybdate, borax, polybenzotriazole, sodium metasilicate, sodium hydroxide, metasilicate, stabilizing agent, defoaming agent and coloring agent, catalyst cases A, B and C are adopted to mix and react under normal temperature and normal pressure, the pH value of the coolant which is generated is controlled within 8-9, the automobile coolant of the invention has the efficiencies of anti-freeze, anti-boiling, anti-corrosion, anti-fouling and can diffuse heat fast, the cooling effect is good, the necessary raw materials can be easily bought on the market, the coolant has non hazardous substances such as sodium nitrite and the like, lowers the harm to environment and human bodies, generates non gelatin during storing periods, can not dilute any inhibitor, and has long-term performance, the manufacturing process of the product is simple, the using equipment is less, the operation is easy, the demanding energy consumption is low, the producing cost is low, the coolant is easy for industrial-scale production and has high promotion and application value and good market prospects.