An improved structure of a plastic CPU foldable fixing frame primarily comprises a seat and two foldable plates which are pivotally installed at two sides of the seat, a CPU is contained and fixed between the two foldable plates. The seat is formed by two bases symmetric in the left and right sides to be directly fixed to a mother board. A communicated tank is located at the bottom of each of the two bases near the inner lateral surface of the CPU receiving tank. Each of the communicated tank is buckled to a respective CPU receiving tank, so that the force applied point of the conductive elastic piece is along the direction of the CPU receiving tank in the inner side of the base. When a CPU fixing frame on the base is fixed to the mother board by a screw or a rivet, the conductive elastic piece will be connected to the ground wire of the mother board by fixing to the screw or the rivet. Thus, as assembling a CPU, the force applied point of the conductive elastic piece will be in contact with the radiator on the outer surface of the CPU, then by the screw and the ground wire of the mother board, they are electrically connected. Thus, the signal interference from the high-speed transformation of the signal in a computer is reduced, further, the running speed of the CPU is increased.
