The invention discloses an automatic cable core distribution device. The automatic cable core distribution device comprises a frame, a single mode double screw mechanism, a rear pull power mechanism,a wire positioning mechanism and a cable clamp, wherein the lower portion of the frame is provided with a guide rail, the single mode double screw mechanism is arranged on the guide rail, the rear pull power mechanism is arranged at a back side of the single mode double screw mechanism and is used for driving the single mode double screw mechanism to integrally sliding forth and back on the guiderail, the wire positioning mechanism is arranged at a front side of the single mode double screw mechanism and is used for positioning a front end of a cable, the cable clamp is arranged above the wire positioning mechanism and is used for clamping the cable, the single mode double screw mechanism comprises an upper screw assembly, a lower screw assembly, an upper screw power assembly, a lower screw power assembly, a crimping assembly and a distribution assembly mounted on the one same module, and cable cores are distributed when the crimping assembly and the distribution assembly contact. Theautomatic cable core distribution device is advantaged in that efficiency is high, the whole process is automatic, labor force is substantially saved, and the distribution quality is guaranteed.