The invention relates to a method for preparing ethylene sulfate. The method comprises the following steps: S1, carrying out a nucleophilic substitution reaction: carrying out the nucleophilic substitution reaction on ethylene glycol and sulfonyl chloride, which are used as starting raw materials, with trichloromethane as solvent to obtain crude ethylene sulfate; and S2, refining and purifying: dissolving the crude ethylene sulfate in trichloromethane, heating and refluxing the obtained solution under the protection of nitrogen to completely dissolve the crude ethylene sulfate, performing cooling recrystallization, performing filtration, and carrying out reduced pressure drying on the obtained filter cake to obtain the crude ethylene sulfate. Compared with the prior art, the method for preparing the ethylene sulfate from the ethylene glycol and sulfonyl chloride through a one-step reaction without a catalyst has the advantages of short reaction route, mild reaction conditions, simple synthesis process, easiness in operation, high safety, simple and easily-available raw materials, low cost and few byproducts; and the prepared product has the advantages of high purity, low moisture content, low acid value, and suitableness for being industrially produced.