Bottle cap opener

A bottle cap opener comprises a cap holding body and a power-aided handle, wherein, the power-aided handle is fixed on the cap holding body, while the cap holding body is provided with an inner hole perpendicular to the power-aided handle; the internal wall of the inner hole is provided with friction teeth. Through seizing up a screw-threaded cap by the friction teeth arranged on the internal wall of the inner hole of the cap holding body clamping the screw-threaded cap and turning the power-aided handle by hand, the screw-threaded cap can be easily taken down; meanwhile, the inner hole takes the shape of a taper hole as the best so as to be used to take down screw-threaded cap of different sizes.