The invention discloses environment-friendly emulsified oil for a hydraulic support and a preparation method of the environment-friendly emulsified oil. The emulsified oil is prepared from the following raw materials in percentage by mass: 15.0 to 25.0 percent of Turkey red oil, 2 to 4 percent of sodium hydroxide, 2 to 5 percent of emulsifier E9600, 3 to 6 percent of sodium benzoate, 3 to 6 percent of naphthenic acid, 9 to 11 percent of sodium nitrite, 4 to 6 percent of EDTA, 5 to 7 percent of triethanolamine, 0.5 to 2.0 percent of borax, 0.1 to 1 percent of benzotriazole and the balance of water. According to the emulsified oil and the preparation method thereof, provided by the invention, the defects that the production technology process is complex, the materials are various and the odor is great in the prior art can be overcome, and the production cost is reduced; in the formula of the emulsified oil, the plant Turkey red oil is adopted, the quality of the emulsified oil is improved due to the selection of the raw materials, the using amount of organic solvents in the whole formula is reduced and the demand of environment protection is met.