Membrane ship ballast water treatment system

The invention relates to a membrane ship ballast water treatment system. A kingston valve communicates with a ballast compartment sequentially via a coarse seawater strainer, a ballast pump and a secondary filtering unit, so that the membrane ship ballast water treatment system is formed, and the secondary filtering unit comprises a mechanical filter and a microfiltration membrane filter. Adopting the mechanical filter and the microfiltration membrane filter as the filtering unit of the ballast water treatment system, which have an automatic filter element cleaning function, the membrane shipballast water treatment system can be automatically cleaned, does not need to be manually operated and maintained, is convenient to use, has a long service life, can save use cost, and can help to enhance the effect of filtering ship ballast water.