Abstract: A fingernail filing assembly includes a power device, a rotation seat having a hollow mounting collar extending from an inner face of the rotation seat to correspond to and to receive therein the axle and a grinding stone securely mounted on top of the rotation seat and a cover threadingly connected to the power device to sandwich therebetween the rotation seat with the power device. The cover has at least one opening defined through the cover to provide an access to the grinding stone such that a fingernail is able to extend into the at least one opening to have the fingernail filed by the rotating grinding stone.