The invention provides an upper discharging tool assembly used for a tower reactor and capable of being replaced quickly. The upper discharging tool assembly comprises a top feeding tool, a middle charging tool and a middle discharging tool; the top feeding tool is a frustum-shaped barrel body; a supporting ring matched with a charging opening on the top of the tower reactor is installed in the middle of the top feeding tool; the middle charging tool is of a dustpan shape and narrows gradually from one side to the other side; an open notch is formed in the position where the middle discharging tool is in butt joint with a discharging opening in the middle of the tower reactor; an adjustable front supporting leg is installed at the front portion of the open notch; the other end of the middle discharging tool is welded to a discharging opening end; and a back supporting leg is installed at the front portion of the discharging opening end. The beneficial effects of the upper discharging tool assembly are that the construction time on replacing tower reactor packing is shortened; the working intensity of operators is lowered; difficulties of high risk operations such as hoisting are reduced effectively; the entire working efficiency is improved; and the unavailable time of the system is reduced.