Method for preparing alkyl polyoxyethylene ether acrylate or alkyl polyoxyethylene ether methacrylic ester

The invention discloses a method for preparing alkyl polyoxyethylene ether acrylate or alkyl polyoxyethylene ether methacrylic ester. The method includes dehydrating alkyl polyoxyethylene ether by the aid of entrainer at first, adding inhibitor, resin solid acid catalyst and crylic acid or methacrylic ester, heating while controlling reaction temperature to range from 70 DEG C to 120 DEG C, stirring, realizing reaction and removing water generated in the esterification reaction by the aid of azeotropy; and carrying out filtering, and decompressing and distilling filtrate to obtain a target product. During reaction, resin solid acid is used as the catalyst insoluble in a reaction system, is easy to be removed by means of separating solid from liquid after the reaction is completed, and can be reused, accordingly, cost is lowered, and the quality of the product is improved. In addition, the ecologically environment-friendly alkyl polyoxyethylene ether is selectively used as a raw material, and prepared alkyl po