Abstract: Belt conveyor is commonly-used material handling equipment in coal preparation plant. Which has the special features of being able to continuously carry out long-distance transportation of materials with a high capacity. For ensuring the belt conveyor can operate continuously in a highly efficient and reliable manner with reduced down time and labor intensity, and bringing it under automatic control, the JHY flexible corrector capable of making automatic correction of mistracking of belt is developed. As evidenced by study and test on the renovated corrector installed on site, the corrector can work remarkably well.