Preparation device and preparation method of submarine cable

The invention provides a preparation device and a preparation method of a submarine cable, and relates to the technical field of cables. The preparation device of the submarine cable comprises a monofilament drawing unit, a water-blocking conductor stranding unit, a three-layer co-extrusion unit, a semi-conductive wrapping unit, a metal shielding wrapping unit, an aluminum-plastic composite belt and sheath continuous production unit and an optical fiber compounding and cabling unit. The preparation method of the submarine cable comprises the following steps: forming a water-blocking conductor; forming a water-blocking conductor with a conductor shielding layer, an insulating layer and an insulating shielding layer; forming a water-blocking conductor with a first semi-conductive water-blocking tape wrapping layer, a metal shielding layer and a second semi-conductive water-blocking tape wrapping layer; forming a water-blocking conductor with an aluminum-plastic composite belt layer and a sheath layer; and formi