The utility model relates to the technical field of adjustable variable resistor, in particular to an adjustable variable resistor, which comprises a first fixed piece, a second fixed piece, a movable piece, a circular support, a first rotating movable piece and a second rotating movable piece. The two ends of the circular support are connected with the first fixed piece and the second fixed piece respectively, and one end of the first rotating movable piece and the second rotating movable piece are hinged through an articulated shaft and one end of the movable piece. Then, one end of the circular support is provided with a carbon film body, the other end of the circular support is provided with a circular rod, the circular rod is surrounded by a number of resistance wires, and the end face of the resistance wire is provided with a contact line surface. The utility model has beneficial effects: the utility model is provided with a first fixed piece, a second fixed piece, a movable piece, a circular support, a first rotating movable piece and a second rotating movable piece. One end face of the circular support is provided with a carbon film body, the other end face of the circular support is provided with a circular rod, the circular support is surrounded by a number of resistive wires, and the end face of the resistive wire is provided with a contact line surface, which has simple structure. Safety and reliability