Scratchless head, a coater for hot melt adhesive, including a connected upper and lower die body; A hot melt adhesive channel is arranged between the upper mold and the lower mold; Wherein: a rotating round roller is arranged at the exit of the hot melt adhesive channel; The round roll is arranged along the length direction of the coating head; There is a gap between the side wall of the round roll and the upper and lower die bodies. Because a rotating round roll is used at the exit of the hot melt adhesive channel between the upper mold body and the lower mold body, the rotation of the round roll takes away the impurities or bubbles in the hot melt colloid in the molten flow state, avoiding scratches or scratches on the coated surface of the product caused by staying at the exit of the hot melt adhesive channel, and greatly improves the quality of the coated hot melt adhesive product; And through the rotation of the round roll completely eliminate the problem of blocking the outlet, but also extend the working time of the coater.