The invention discloses a bridge bearing painting line exhaust gas purifying device. The bridge bearing painting line exhaust gas purifying device comprises a blotter-type oil filter, a first spray washing device, a second spray washing device, an entrainment (water) removing mechanism, a compound photocatalysis mechanism, an odor controller and a centrifugal fan which communicate in sequence in aflow direction of exhaust gas, wherein the first spray washing device is used for spraying a sodium hydroxide solution, the second spray washing device is used for spraying deodorant liquid, the entrainment (water) removing mechanism is used for drying the exhaust gas, the compound photocatalysis mechanism is used for removing volatile organic compounds in the exhaust gas, the odor controller isused for removing volatile molecules with small molecular weight, the bridge bearing painting line exhaust gas purifying device further comprises a chimney connected with the centrifugal fan, and thecentrifugal fan is suitable for pumping the gas and discharging the pumped gas through the chimney. The bridge bearing painting line exhaust gas purifying device can effectively remove pollutants of xylene, non-methane total alkanes, odorous substances and the like which exist in the exhaust gas, and an exhaust treatment effect is good.