The invention relates to the technical field of industrial emulsifiers, particularly to a safe fuel oil emulsifier, which comprises the following raw materials by weight: 60-80 parts of sorbitan fattyacid, 40-50 parts of nonylphenol polyoxyethylene ether, and 0.15-0.3 part of barium naphthenate, wherein the raw materials comprise, by weight, 65 parts of sorbitan fatty acid, 45 parts of nonylphenol polyoxyethylene ether, and 0.2 part of barium naphthenate. According to the present invention, the safe fuel oil emulsifier based on the formula has characteristics of easily available raw materials, low cost and simple operation, and the prepared fuel oil has characteristics of no flammability, no explosive, a certain cleaning effect on the internal combustion engine, less carbon deposition andhigh use efficiency.