The invention discloses a DC motor with long service life, comprises a casing, a front cover on the right side of the casing, a fixing shaft on the left side of the front cover, a rear cover on the left side of the casing, a stator assembly on the top and bottom of the casing inner cavity, and a fixing plate on the left side of the casing inner cavity. In accordance with that present invention, first heat conduction plate, rotating shaft, Magnetic tile, mounting plate, the second heat conduction plate and the heat dissipation hole are arranged, the stability of DC motor can be ensured, at thesame time, the heat generated by the motor in operation can be discharged from the inside of the housing in time, The utility model has the advantages of prolonging the service life of the motor, simple structure, convenient maintenance and replacement of the interior after damage, and solving the problems that the vibration amplitude is large and easy to be damaged in the working process, the maintenance and replacement of the interior are impossible, the service life is short, and the use of the motor is affected. The utility model has the advantages of simple structure, convenient maintenance and replacement of the interior after damage, and solves the problems that the vibration amplitude is large and easy to be damaged in the working process, and the service life is short.