The invention provides an intelligent maintenance system based on a WMI technique and a decision tree classification algorithm. The intelligent maintenance system comprises a client, a control terminal, a log server and a database server, wherein the client and the control terminal achieve data communication with the log server through the Internet, and the log server is in communication connection with the database server. According to the intelligent computer accessory maintenance system based on the WMI technique and the decision tree classification algorithm, an application directly acquires error information of a computer accessory or manual input error information of a user through the WMI technique, the client accesses the server through the Internet, and the server accurately acquires a wrong solution through the decision tree algorithm and feeds the solution to the client; meanwhile, after the user solves a failure of the computer accessory, the server automatically generates a maintenance log file for being used in next-time maintenance, the precise solution is provided for maintenance of the computer accessory, and meanwhile extensive expenditure is saved.