The invention relates to the technical field of an intelligent terminal and provides a method and a device for parallel running of application interfaces. The method comprises the steps: a touch display screen acquires a first switching request for switching a first application; and after confirmation of the first switching request, the intelligent terminal switches a current operation interface and switches the first application from a complete layout operation interface into a first-stage simplified operation interface located in a border region of the touch display screen or in an intermediate region of the touch display screen, and the operation interface is displayed in a manner that the first application covers the operation interface of a second application, wherein the operation interface of the first application can be switched between a semitransparent state and an entity state. According to the method and the device for parallel running of the application interfaces, the problem that mutual interference is liable to occur when the applications run in parallel is solved, various parallel manners are provided to satisfy different usage requirements of a user and the satisfaction degree of user experience is improved.