The utility model relates to a rotatory gullet tooth of coal conveying system removes debris machine fender and foresees debris self cleaning device, its characterized in that includes a fixed comb shape board that sets up at coal -conveying belt feed opening department's material chute and debris chute boundary, the comb shape board corresponds with the rotatory gullet tooth who passes from its gash, arranging by a plurality of vertical lath intervals equipartition, the rigid coupling forms on the bottom level lath, the slope construction section that vertical lath includes vertical fender material section and is used for linking firmly material chute or debris chute groove face, a plurality of vertical fenders material section constitutes the vertical striker plate of comb shape board, a plurality of slope construction sections and bottom level lath constitute the slope mounting panel of comb shape board, lay the soft rubber lath that the width is greater than vertical fender material section width in every vertical fender material section of a vertical striker plate side, and form rotatory gullet tooth between adjacent soft rubber lath and pass through the clearance, be equipped with the strengthening rib on every vertical lath. The beneficial effects of the utility model are that: the efficiency of the edulcoration is improved.