Abstract: A power supplying device is embedding in a hole of a desk. The power supplying device includes an annular base, a ring, and a charging body. The annular base has a through hole. The ring is surrounded the annular base. The charging body has a shell and a charging circuit, which is located in the shell. An outer sidewall of the shell contacted with the through hole of the annular base. A concave for passing through a wire is formed on the outer sidewall. A maximum outer diameter of the shell is adapted to an inner diameter of the through hole of the annular base. An outer diameter of the ring is greater than an inner diameter of the hole of the desk.