A shower assembly with supporting arm has: a water inlet connected to the supporting arm and to a descending pipe; a switching valve body fixed and connected to the end of the pipe through an outer water inlet and having an outer and a inner water outlet connected to a ascending inner tube in the pipe; and an upper branch pipe fixed to the location of the water inlet and connected to the inner tube, of which the end has one or at least one upper water outlet, wherein the switching valve body has a valve core inside, which makes the pipe connected to the outer and the inner water outlet respectively or simultaneously. The switching valve body that is at the end of the pipe controls the current export from the upper and the outer water outlet beneath the switching valve body.