The invention relates to a method and system for rapidly switching main interfaces in an Android system. The method includes the steps that a key event of a Home key of the system is obtained; whether the key event is a click event or a long-time pressing event is judged; when the key event is the click event, a window manager queries whether the multiple main interfaces exist in the system or not, if the multiple main interfaces exist, the main interface used recently is obtained and started through the system, and otherwise one main interface is started directly; when the key event is the long-time pressing event, the window manager queries whether the multiple main interfaces exist in the system or not, if the multiple main interfaces exist, the system obtains information of the multiple main interfaces and selects the selected main interface to start, and otherwise, one main interface is started directly. When operating the Home key, a user only needs to click or press the Home key for a long time to change the main interfaces, so that the user rapidly switches the main interfaces, the operation of complex default main interface setting is avoided, and usage experience of the user is improved.