Personalized teaching is an important guide for the reform and innovation of English education in colleges and universities. The application of big data technology in English personalized teaching is conducive to the analysis of the needs of English personalized teaching, further speeding up the construction of English personalized education resources, helping to improve the intelligence level of English personalized teaching, and accelerating the realization of English personalized teaching and multi-field fusion. English teachers in colleges and universities reform English teaching based on the background of big educational data. They need to correctly understand the meaning and characteristics of big educational data and emphasize the significance of English teaching reform under this background. Effective reform of college English teaching under the background of big educational data.