The invention discloses a preparation method of a
phosphate ester compound, belonging to the field of
phosphate ester compounds. The preparation method of the
phosphate ester compound comprises the following steps: putting
sodium diethyl phosphate into a reactor as a
raw material, then putting a catalyst, a reaction
solvent and an alkylating
reagent into the reactor, conducting stirring, heating and reacting for a period of time, and finally, carrying out post-treatment on reaction liquid to obtain
triethyl phosphate. According to the method,
sodium diethyl phosphate is taken as the
raw material, so the waste is treated by the waste, resources are recycled, and
pollution is reduced;
chloroethane is taken as the alkylating
reagent; and thus, a novel, efficient, environment-friendly and economical method for synthesizing a
triethyl phosphate compound is provided.