The present invention relates to a power coupling device. The power coupling device comprises a gear outer ring, and an input shaft and an output shaft which stretch out of two sides of the gear outer ring, the input shaft is connected with the gear outer ring through a planetary gear mechanism, and the output shaft is fixedly connected to a planet carrier at one side of the planetary gear mechanism. The power coupling device also comprises a transmission portion which sleeves the output shaft and is connected with the gear outer ring, the transmission portion is provided with an electromagnetic control mechanism having a linkage portion, and the electromagnetic control mechanism acts under an external control signal and enables the linkage portion to be connected with the planet carrier at one side of the planetary gear mechanism so as to achieve transmission connection between the gear outer ring and the output shaft. An outer circumferential wall of the gear outer ring is also provided with permanent magnetic steel. The present invention also relates to a motor provided with the power coupling device. The power coupling device is controlled by the control signal, power distribution can be changed, and a speed change function is achieved. Due to the fact that the configured permanent magnetic steel can form a rotor in the motor, a speed changer, a coupler and a motor rotor can be integrated, occupation space can be reduced, and integration level is high.