The invention discloses an information security offense and defense drill competition system for the power industry, comprising an experimental platform, an experimental environment customization module and an application scenario customization module. The experimental platform is used for implementing offense and defense drill competition, being connected with the experimental environment customization module and the application scenario customization module, building attacks and carrying out security test, and includes a knowledge base management module, an online learning module and an offense and defense competition module. The experimental environment customization module is used for customizing a comprehensive drill scenario, analyzing malicious codes, and carrying out Intranet penetration and hole mining. The application scenario customization module is used for power information security training, information security offense and defense scenario drilling, industrialized depth customizing, security product testing, security technology researching and security assessment testing. According to the invention, the information security independent control capability, the safety monitoring capability, the notification and warning capability, the emergency disposal capability and the whole-process management control capability of companies can be improved.