The invention relates to a potentiometer support positioning tool which comprises a base plate. A positioning boss is arranged on the top surface of the base plate. Size of the positioning boss is identical to that of a caulking groove arranged below the potentiometer support. Positioning rod are arranged at twos sides of the positioning boss of the base plate and sleeved on pressure blocks. Adjusting blocks are arranged below the pressure blocks. A positioning plate is fixed at one side of the base plate 2. The potentiometer support positioning tool is simple in structure, economical and practical, convenient to operate and high in processing accuracy.