Deep-sea mining ship system and operation method thereof

The invention discloses a deep-sea mining ship system and an operation method thereof. The deep-sea mining ship system comprises a main ship body, an ore collecting box system, a mining machine group and a lifting system. The main hull comprises a vertical bow stem on the water part and a bulbous bow on the underwater part; ship side reinforcing structures provided with mining machine groups are arranged on the two sides of the ship body; a portal crane is arranged on the vertical stern; the mine collecting box system is arranged under the main ship body and connected with the main ship body through the lifting system. The lifting system is located between the main ship body and the mine collecting box system and comprises an on-board lifting system of the overwater part and an underwater lifting system of the underwater part. The ore collecting box system comprises an ore collecting box, adopts a gravity detection automatic lifting mode, and improves self buoyancy through a horizontal air bag; the mining mac