The invention discloses a return roller on a belt conveyor. The return roller on the belt conveyor comprises a conveyor, wherein baffles are arranged on a belt surface of the conveyor at intervals; the return roller is composed of a left roller, a right roller and a rotating shaft; a baffle roller is arranged on the middle part of the rotating shaft; the baffle roller has a hollow cylinder; metal rods are arranged on the outer surface of the cylinder at intervals; the metal rods are uniformly distributed in a cage form; gaps are remained between the adjacent metal rods; the two ends of the cylinder are assembled with the rotating shaft through a bearing base and a bearing; the width of the gaps is more than the thickness of the baffles. The return roller on the belt conveyor has a simple structure, is convenient in use and is capable of preventing the baffles from shaking. The running of the belt conveyor is smoother, so that the service life is prolonged.