The utility model discloses a folding stool special for a portable relay protection tester. The desk comprises seat plate supporting legs, desk plate supporting legs, connecting shafts, a seat plate,sliding grooves, supporting frames, connecting seats, top holes, top columns, a desk frame, a desk plate and limiting blocks. The seat plate supporting legs and the table plate supporting legs are hinged through connecting shafts; front and rear ends of the connecting shaft are connected; the front end of the seat plate is hinged to the tops of the two seat plate supporting legs. Sliding grooves are formed in the side walls of the seat plate supporting legs and the side walls of the table plate supporting legs respectively; the supporting frame is of a U-shaped structure and is in sliding connection with the sliding groove. The supporting frame is fixed to the bottom of the seat plate and the bottom of the table frame, the supporting frame is hinged to the connecting base, semi-circular top holes are formed in the front side and the rear side of the seat plate, ejection columns are arranged on the inner sides of the two table plate supporting legs, the tops of the ejection columns aresemi-spherical, the interiors of the ejection columns are connected with the table plate supporting legs through springs, and the ejection columns are buckled with the ejection holes. According to theutility model, the working efficiency and comfort of workers are improved, and the working fatigue of the workers is relieved.