The invention provides an eccentricity-adjustment-free die device for multi-core cable insulation extrusion and extrusion manufacturing technology. The device comprises a multihole die core, a die sleeve seat sleeves the multihole die core, and a gap is formed between an inner wall face of the die sleeve seat and an outer wall face of the multihole die core; the front end of the multihole die core is conical, and the rear end of the die core is provided with a die core chamber which radially narrows towards the front end face; one end of the die core chamber extends outwardly, a plurality of die core nozzles are disposed in an extension part; and an end of the die sleeve seat is provided with a circular hole, a die sleeve plate matching the circular hole is installed at the position of the circular hole, the die sleeve plate is provided with a plurality of die sleeve metering holes, the die sleeve metering holes correspond to the die core nozzles, and concentricity is guaranteed by utilizing positioning pins. The eccentricity-adjustment-free die device has the advantages of compact and reasonable structure and convenient operation; one end of the multihole die core is provided with the multiple die core nozzles, the die sleeve seat matching the die core nozzles and the die sleeve plate are installed, and the die sleeve plate is provided with the die sleeve metering holes matching the die core nozzles, so a multi-core cable can be processed at the same time without eccentric adjustments.