A method for replacing an application interface of an electronic cigarette includes the steps of receiving a mode switching request after starting up a system, and displaying a network configuration interface based on the received mode switching request; acquiring a network address of a server when the electronic cigarette is connected to a network, and accessing the server based on the acquired network address of the server automatically; sending a request for downloading interface information to the server, and receiving the interface information from the server based on the request for downloading interface information; and replacing the application interface of the electronic cigarette with the interface information when receiving a request for replacing the application interface of the electronic cigarette. A device for replacing an application interface of an electronic cigarette and an electronic cigarette are also disclosed. With the method, the device and the electronic cigarette, the application interface of the electronic cigarette can be personalized when required.