The invention discloses a dynamic module loading method and device. The method comprises the following steps: when requiring to dynamically load an application module, establishing a new servlet service object; when receiving a servlet request, forwarding the received servlet request to a new servlet service object by using the original servlet service object to dynamically load the application module by the new servlet service object; and after the new service object is established, destroying the servlet service object established during last dynamic module loading. By the method disclosed by the invention, a project framework does not need to be established again, when the application module is loaded dynamically every time, only the new servlet service object needs to be established, therefore, dynamic loading to modules can still be realized under the condition that the project framework is not changed, the dynamic module loading method is easy to realized, moreover, learning cost is low, and consumed labor and time are less.