A black card controlling method and an electronic device thereof are disclosed. The black card controlling method comprises the steps of: providing an electronic device used for photographing, wherein the electronic device comprises a photosensitive element, a shutter, a lens module and a black card device; obtaining an image by the photosensitive element; obtaining light contrast information by analyzing the image; moving the black card device and setting a shaking parameter of the black card device according to the light contrast information; starting the shutter; and shaking the black device according to the shaking parameter of the black card device.