The invention discloses a power traction system of a suspending sky train, which comprises a traction frame, a driven wheel unit and an active wheel unit; the front end and the back end of the traction frame are provided with a set of driven wheel unit, and the middle part of the traction frame is provided with a set of active wheel unit; the active wheel unit comprises an active wheel hub, a transmission shaft, a motor and a reducer; output shafts at both ends of the reducer are connected with the transmission shaft, and the transmission shaft is installed on the traction frame through the bearing; the outer end of the transmission shaft is connected with the active wheel hub, and the input shaft of the reducer is arranged downwards; the input shaft of the reducer is connected with the motor, and the motor is connected with a high-pressure lead arranged at the top part of the suspending lead rail through an electric brush; the lower part of the traction frame is connected with the suspending sky train through a steering suspending frame. By adopting a unique structure design, the steering suspending frame guarantees the connection intensity while provides flexible traction for theguiding traction of the suspending sky train; compared with the existing hard connection, the suspending sky train is fiercely swayed in the steering process under the traction of the power tractionsystem.