Multi-source data fusion technology is conducive to data collection and analysis, and is frequently used in the teaching of students. This study applies multi-source data fusion technology to evaluate the comprehensive quality of students. By examining the basic function principle of multi-source data fusion technology, the study establishes an evaluation platform for the comprehensive quality of students based on multi-source data fusion. The platform is then applied to the comprehensive quality evaluation of students across grades. Furthermore, the study compared and analyzed the problems of different grades and proposed methods for improving the comprehensive quality of students, which is beneficial to their improvement in this regard. In other words, this study takes the comprehensive quality evaluation of students of all grades in the Quzhou College of Technology as an example. Furthermore, it conducts and in-depth analysis of the evaluation methods of the comprehensive quality of students, which, thus, providing a certain method and theoretical guidance for the evaluation of the comprehensive quality of students among colleges.