With the development of the Internet, mobile network not only changes people's lifestyle, but also transform the communication way of people. Especially in universities, it has enormous impact among universities when more and more personal speeches spread, collide and integrate by the network. How to monitor the network public opinion data, and give correct guidance to the college network public opinion is the key problem that universities need to solve urgently. This paper proposes the construction of college network public opinion system based on data mining technology and data analysis technology, in order to guide the network public opinion more active and healthy, so as to promote the harmonious development of campus culture.