An external module, an electronic device and a method for driving an electronic module are provided. The electronic device includes a host and multiple external modules. The external module adapted to be removably connected to the electronic device includes a body, a first connector, a moving assembly and a second connector. The body has multiple connecting ports. The first connector is fixed on one of the connecting ports. The electronic device is adapted to be electrically connected to the first connector for providing power to the external module to drive the moving assembly. The second connector is assembled to the moving assembly disposed in the body and electrically connected to the first connector. The moving assembly drives the second connector to switch between the connecting ports, and the connecting port where the second connector is located is different from the connecting port where the first connector is located.