Preparation method of secondary alcohol polyoxyethylene ether

The invention relates to a preparation method of secondary alcohol polyoxyethylene ether, which adopts the technical scheme that: the preparation method of the secondary alcohol polyoxyethylene ether comprises the following steps: in the presence of an acid catalyst, reacting a secondary alcohol with ethylene oxide to obtain a secondary alcohol polyoxyethylene ether crude product; mixing a first treating agent with the crude product to obtain an intermediate material I; mixing a second treating agent with the intermediate material I to obtain an intermediate material II; filtering the intermediate material II to obtain filtrate; mixing the filtrate with water, standing above the cloud point of secondary alcohol polyoxyethylene ether for layering to obtain an oil phase; removing impurity water in the oil phase to obtain a refined product of the secondary alcohol polyoxyethylene ether; wherein the first treating agent is at least one selected from lithium hydroxide, calcium oxide, calcium carbonate, barium hydroxide, barium oxide, magnesium hydroxide, strontium hydroxide and strontium oxide; the second treating agent is at least one of potassium hydroxide, sodium methoxide, potassium methoxide, sodium ethoxide and sodium carbonate.