The rod centralizer consists of a coupling, a centralizing sleeve, and a sub, and is implemented in accordance with SY/T5832-2009 standards. Principle: Connected to the sucker rod, the outside diameter of the righting sleeve is greater than the outside diameter of the sucker rod coupling to righting the effect; The use of righting sleeve is a high strength wear-resistant material, and tubing contact to support the body wear, and reduce the wear of tubing, in order to achieve the purpose of anti-bias wear. It is especially suitable for Wells with offset wear of tubing and rod string, such as deviated Wells, directional Wells, and Wells with dogleg sections. For sand production, heavy oil, high water cut, deep pumping and other harsh environment production Wells, by combining other measures, has a remarkable effect.