Ship ballast water treatment system

A ship ballast water treatment system comprises a ballast pump and a control unit. A turbidity sensor is arranged at an outlet of the ballast pump and connected with a hydraulic spinning filtering unit through a control valve, an water outlet of the hydraulic spinning filtering unit is connected with a meshy filtering unit through a booster pump and a check valve, and an output of the meshy filtering unit is connected with a ballast tank through a reaction unit. The ship ballast water treatment system can choose filtering processes according to water quality conditions, and is better adaptive to water areas of various kinds, higher in treatment capability, better in environment friendliness and applicable to various ships.