The invention discloses a rescue method of a hand-cranked three-folded bridge type rescue device, adopts the hand-cranked three-folded bridge type rescue device is adopted, and particularly relates to an emergency rescue device which has a telescopic rod, has three foldable platforms arranged at the top end of a hand-cranked jack, is used for automobile rescue, can bear objects, and achieves rapid supporting. According to the rescue device, the telescopic rod is arranged between the platforms and the hydraulic jack; four groups of tooth-shaped bulges are arranged inside an outer sleeve body of the telescopic rod; self rescue can be achieved through independent operation, so that manpower, financial resources and time are greatly saved; and wheels of a vehicle are supported through the three foldable platforms on the jack, the self rescue is achieved through adjusting the longitudinal and horizontal directions of the three foldable platforms, and the vehicle can longitudinally move and horizontally move through the three foldable platforms, so that the purposes that the operation is safe, the effort is saved and the operation is convenient are achieved, and the practicability is high.