A function expanding system is provided and includes an image capturing device and a function expanding stand. The image capturing device includes an image capturing module, a device processing module, and a first connecting interface. The device processing module is electrically connected to the image capturing module, and the first connecting interface is electrically connected to the device processing module. The function expanding stand includes a second connecting interface, a stand processing module and a function expanding module. The second connecting interface is removably connected to the first connecting interface. The device processing module sends a control signal to the stand processing module to execute a function. According to the function expanding system, the image capturing device may be paired with different function expanding stands for expanding functions.