The invention discloses a power generation motor temperature detection device and method. The device includes a heat conduction copper pipe, a C-shaped elastic metal pipe, a first gear, a second gear,a third gear, a pointer, a brush, a driving roller, and a driven roller. One end of the heat conduction copper pipe extends into a motor shell, the C-shaped elastic metal pipe communicates with the other end of the heat conduction copper pipe, the second gear is meshed with the first gear, the third gear is meshed with the second gear, the pointer is arranged on a rotating shaft of the third gear, and the brush is arranged on the pointer. A paper roll is arranged on the driving roller, the paper roll is connected with the driven roller, and a rotating shaft of the driving roller is connectedwith the motor; the brush is in contact with the surface of paper unfolded between the driving roller and the driven roller, and the free end of the C-shaped elastic metal tube is connected with one side face of the first gear through a rotating shaft. The device has the characteristics that the temperature variation in the motor shell can be accurately recorded, and reliable data support is provided for the structural improvement of the motor.