The invention discloses a method for preventing the downtime of a website. The method comprises the following steps: obtaining the IP of a server website; judging whether the analysis data of the IP is abnormal, and if so, replacing the IP; if not, judging whether the WEB server is abnormal, and if yes, replacing the WEB server; wherein a plurality of WEB servers form a server cluster; is not, whether the service process of the WEB server is abnormal is judged, and if so, restarting the service process. According to the method, through optimizing three levels of the network, the hardware and the process, load and high availability are done in the network and hardware levels, real-time detection is done at the process aspect, the probability of website downtime is reduced, the human resource cost of website operation and maintenance personnel is effectively saved, and the working efficiency of website operation and maintenance is improved.