Display method of HMI system for hot continuous rolling heating furnace

The invention relates to the field of hot continuous rolling and aims to solve the problem that the background color change of a monitoring menu button in an existing HMI system for a hot continuous rolling heating furnace is not matched with a corresponding monitoring picture. The display method of the HMI system for the hot continuous rolling heating furnace comprises the following steps: defining variables in a project file of a server, and instantiating the variables; establishing a corresponding relationship between the instantiated variable value and the monitoring picture; when it is monitored that an operator clicks a monitoring picture switching button on a certain client, assigning a value to an instantiated variable corresponding to the monitoring picture, writing the instantiated variable into a preset value corresponding to the monitoring picture switching button, and opening the corresponding monitoring picture by the client; and after the client monitors that the value of the instantiated varia