A cable specification classification device includes a barrel which is horizontally arranged, a rotating disc, a rotating motor and cable screening blocks, wherein the barrel and the rotating disc are coaxially arranged, the rotating disc is arranged at one end of the barrel and is tangential to the inner side surface of the barrel, the rotating motor is fixedly arranged in the barrel, a rotating shaft of the rotating motor is connected with the center of the rotating disc, a chute is formed in the outer end surface of the rotating disc and extends to the cylindrical surface of the rotating disc in the radial direction of the rotating disc, a sliding block is arranged in the chute and connected with one end surface of the chute through a first spring, limiting grooves are formed in the outer end surface of the barrel and extend to the inner side surface of the barrel in the radial direction of the barrel, grooves are formed in the left and the right side surfaces of each limiting groove, and cable grooves are formed in the inner side surface of the barrel in the axial direction of the barrel and communicated with the limiting grooves.