The utility model belongs to the technical field of process equipment, and relates to a tool bit frame for edge milling of a chemical milling forming sample plate. The device comprises a base, a fixing bolt, a clamping wheel, a rotating shaft screw and a supporting wheel. The base is of a round cover structure, a through hole is formed in the center of the bottom face, and two parallel lugs are arranged on one side of the bottom face. The fixing bolts are uniformly distributed on the side surface of the base and are in threaded connection with the base; the clamping wheels are two stepped shafts of which the axes are parallel to each other and the centers are provided with through holes, and are mounted on two sides of the through holes in the bottom surface of the base through rotating shaft screws; the rotating shaft screw is of a screw structure and is in threaded connection with the base; the supporting wheel is of a cylindrical structure with a through hole in the center, and is mounted between the two lugs on the bottom surface of the base through a pin shaft; the pin shaft is of a cylindrical pin structure, and the pin shaft is in interference fit connection with the lugs ofthe base. The device has the characteristics of simple structure, convenience in operation and high machining precision, the edge machining efficiency of the chemical milling forming sample plate canbe improved by 80 percent, and the labor intensity of workers is reduced by 60 percent.