The multi-function batch password-changing tool for IT system uses BAT, VBS, scurecrt script and combination with command of operating system and network devices. It realizes function of automatically batch changing password of mainstream Linux, UNIX operating system and network device. It solves the difficulty that changing password of IT system is very hard, tedious and time-consuming. It provides a good tools to ensure the frequency changing IT system password and the password length so as to enhance the security of IT system. The test and practical application indicate that the comprehensive efficiency of the tool is more than 10 times of manually changing and verifying password, and it has high reliability.