The embodiment of the invention provides an encapsulation method of a browser control part and a device thereof. The method comprises the following steps of: encapsulating a defined method event intothe browser control part by spreading an application function interface of a JAVA script; when the browser calls the application function interface by the JAVA script, calling a corresponding functionmapping device to distribute corresponding identification for the function of the defined method event by the browser control part; obtaining the function of the defined method event and the parameter of the function by the identification; and according to the function of the defined method event and the parameter of the function, calling the corresponding application function interface to execute the defined method event. By implementing the technical scheme, the invention can lead the browser control part and a customer end to be better integrated, and improves expansibility; and all the application program interfaces can be dynamically added, and the mapping relationship of the function identification is more flexible.