The invention discloses an online environment intelligent deployment system and method of a CTF online competition platform. The system includes an online competition platform server terminal, a reverse proxy server terminal, a virtual machine management platform server terminal and several virtual machines created by means of a virtual machine management platform and used for operating a question environment; the online competition platform server terminal is provided with an environment generation module and an environment recycling module, the virtual machines used for operating the question environment are created by means of the virtual machine management platform server terminal according to question configuration information, and port proxy is conducted through the reverse proxy server terminal so that the question environment virtual machines can be accessed through the public network IP and a port. According to the system and method, real-time intelligent deployment of the question environment is achieved through the virtualization technology, the question environment is accessed by deploying a reverse proxy on a limited public network address machine, at the same time, the Internet for the question environment is configured to be independent, it is ensured that the environment can be accessed and isolated, and the safety of other property is ensured.