Machine learning is an interdisciplinary discipline, involving many fields, from probability theory to algorithms, to statistics, and other things, all of which enable computers to simulate human learning methods. Machine learning can also greatly enhance the efficiency of learning by dividing the original content into knowledge structures. Turing proposed to build a learning machine and promoted the progress of practical application, which is a great progress in machine learning. Although banks have a large amount of information data, the traditional marketing methods can not fully mine the value of these large amounts of data. Through the use of machine learning technology to establish a precision marketing system, use the machine learning model on the big data platform to conduct in-depth analysis of user behavior, needs, preferences, etc., and then carry out the implementation of the marketing plan for the mined potential customers. This paper analyzes the relevant content and application of machine learning, and gives a more comprehensive analysis of the system.