One-line cleaner is for the return belt cleaning. It is mainly used in front of the rear bend pulley and in front of the heavy vertical tensioning device of the belt conveyor. It can especially be used to clean the empty section of the two-way running belt. It has the characteristics of acid and alkali resistance, flame retardant and antistatic, high wear resistance, and does not damage the belt. The blade is made of high-strength polyurethane, the V-shaped design ensures belt cleanliness, and the automatic gravity design ensures automatic-compensation when the blade wears out.