The utility model provides an open water system motor anti -Vibration structure, rotor including output power, the rotor includes relative drive end and non - drive end first axle bed and second axle bed has set gradually on the drive end be provided with the third axle bed on the non - drive end, install the cylindrical roller bearing on the first axle bed install deep groove ball bearing on the second axle bed install deep groove ball bearing on the third axle bed. The utility model discloses with the former cylindrical roller bearing of deep groove ball bearing replacement, can guarantee axle clearance under the circumstances that does not lose former produce effect, eliminate the potential safety hazard of motor existence in service, guaranteed the stability of open water system, improved security, the reliability of unit operation greatly, economic efficiency is also improved by a wide margin. And reform transform back equipment defect greatly reduced, and the bearing life obviously prolong, and spare parts, artifical maintenance cost obviously reduce.