The invention relates to a real-time web publishing method of a real-time monitoring system across security zones. The method includes: transforming a monitoring interface of a security zone one intoxml data, and sending the same to a web server of a security zone three; and issuing a data request instruction by an external network browser according to analysis on of the security zone three on the xml data, and thus obtaining monitoring data of the security zone one through the security zone three. The method simplifies development of a real-time web publishing system, ensures security, and enables the monitoring system interface, which can only be seen by specific personnel in a monitoring room through a specific application originally, to be viewed by any personnel, who needs to know asystem running situation, outside the monitoring room at anytime and anywhere through the web browser.