A fixing structure for a vertical tap comprises a vertical tap, a mounting member, a fitting member, a fixing ring, and a decorative loop, wherein the mounting member for being secured in the ground includes a receiving chamber arranged on the top thereof and having two retaining tabs attached on the upper end thereof, the upper end of the fitting member screws with the lower end of the vertical tap, and the fitting member includes two opposite fastening projections disposed on the outer periphery at the lower end thereof and extending outwardly therefrom, the fixing ring is fitted onto the external rim of the vertical tap and then secured in a wooden floor by using a number of wood screws and further engaged with the internal rim of the vertical tap by way of a bolt, the decorative loop is covered onto the fixing ring, thereby supporting and securing the vertical tap easily.