Through a systematic review of domestic and foreign research on the quality of postgraduate education, this study defines and sorts out the relevant concepts and theories of postgraduate education quality, postgraduate education quality evaluation, and postgraduate education quality assurance. And put forward the strategy to improve the quality of postgraduate education in my country. Using big data technology to monitor education quality data, based on this analysis the main factors affecting the evaluation of postgraduate education quality under the background of "Internet +". Further use the analytic hierarchy process to build a postgraduate education quality evaluation index system, and determine the weight of each index, and through the analysis of the data results, put forward an effective path to improve the quality of postgraduate education in my country.