In order to conveniently apply the stimulus signals to the tool magazine and dynamically observe the instantaneously response of the device in repair process, three layer network structure was adopted to connect the personal computer, programmer controller and touch screen aiming to construct a special testing bench topologically. The device could be used to test tool disk, tool pocket and tool arm respectively and comprehensively. The research shows that the testing bench plays an important role in fault location, performance analysis and mechanical adjustment in the process of maintaining tool magazine. The displacement of local mechanical parts accompanying signal sampling, curve formation and mathematical modeling can help repair workers find out hidden deeply fault or provide valuable information about the regulation.