In recent years, with the continuous development of Internet technology, people's lives have been inseparable from mobile communications. However, the continuous development of the information society has led to the diversification of user needs, and the ever-increasing user needs continue to increase the load on mobile networks. Data mining technology, as a new type of practical intelligent technology, can dig out the potential connections between data from a large number of complex and small-scale information. Using data mining technology to build models and apply them in practice can effectively improve work efficiency. Therefore, this article will first explain the related concepts of data mining technology and network optimization, and then will analyze and introduce the related applications of data mining technology in mobile communication network optimization.