The invention provides a portable walking-replacing machine which comprises a walking-replacing box, a folding chair, a folding plate, and a folding plate steering connecting end arranged at the lower end of the back surface of the walking-replacing machine, wherein the inner part of the box is divided into two function layers which are isolated up and down, the upper function layer is provided with a box body storage space and a battery bin, the lower function layer is provided with a power mechanism bin and is connected with an active wheel, the folding plate is connected with and rotates around the folding plate steering connecting end, a movable structure capable of regulating the total length of the folding plate is provided, the foldable chair structure is arranged in front of the walking-replacing machine box, sliding lifting frames moving up and down are arranged on the circumference around the lower end of the walking-replacing machine box, the left side and the right side ofthe walking-replacing machine box, close to the sliding lifting frame in the front, are provided with start wheels, and the sliding lifting frame close to the back is internally provided with an overturning frame. The portable walking-replacing machine combines functions of a suitcase, a folding chair and an electric scooter, and has the advantages of small occupation space of all conversion structures, simpleness in conversion, and convenience for carrying because the portable walking-replacing machine looks like the suitcase after completed folded.