The invention discloses a portable extensible high stool. The portable extensible high stool comprises an insulating stool face and four stool legs, wherein one side of the end face of the insulating stool face is provided with a folding stool face, and the insulating stool face and the folding stool face are connected through a hinge shaft. In the four stool legs, two stool legs away from the folding stool face are fixed stool legs, and the other two stool legs are movable stool legs. The upper portion and the lower portion of each fixed stool leg are provided with one extensible device perpendicular to a plane where the two fixed stool legs are located, one end of each extensible device close to the folding stool face is fixedly connected with the movable stool legs, and one side of each movable stool leg away from the fixed stool legs is provided with an electric magnet. A cross beam is arranged between two fixed stool legs, a storage battery for supplying electricity for the electric magnet is installed on the cross beam, and when each extensible device extends out, the movable stool legs support the lower surface of the folding stool face. The portable extensible high stool can be folded and is adjustable in height, convenient to carry and stable and reliable in use, and a space can be saved.