Through the analysis of failure reasons of a supporting roller bearing sealing system for cold rolling equipment,a combination sealing solution composed of dustproof and anti-fouling seal,metal labyrinth seal,skeleton water seal and skeleton oil seal was proposed.The dustproof and anti-fouling seal can prevent external emulsion and cooling water entering the support rollers,the skeleton water seal and support ring act as sealing oil and preventing the water and cutting fluid entering the support rollers,and skeleton oil seal can effectively prevent the internal oil leakage.After transformation,the sealing system has good sealing effect,and service life is greatly extended.