Water purifier and filter cartridge device thereof

A filter cartridge device, wherein the filter cartridge device comprises a housing, a filter medium, and a water stopping assembly,

• the housing has a filter cavity, the filter medium is disposed in the filter cavity, and filter channels are formed in the filter cavity;
• a first opening that communicates with the filter cavity is disposed on a first end of the housing, and the water stopping assembly comprises a water retaining member and a water dividing member that can rotate relative to each other, the water retaining member is disposed in the first opening and can rotate relative to the housing, the water dividing member is disposed in the filter cavity and is connected to the water retaining member through a rotating shaft structure, the water dividing member can rotate together with the housing, and the filter medium is connected to an end of the water dividing member away from the water retaining member;
• the water dividing member has water dividing channels and water dividing member docking ports that communicate with the water dividing channels;
• the water retaining member has water retaining channels and water retaining member docking ports that communicate with the water retaining channels;
• and the water dividing member docking ports and the water retaining member docking ports are controlled to be docked or undocked through relative rotation of the water dividing member and the water retaining member, to connect or disconnect the water dividing channels and the water retaining channels;
• and
• the water dividing member also has water dividing member water inlets-outlets, and the water dividing channels communicate with the filter channels through the water dividing member water inlets-outlets;
• and the water retaining member also has water retaining member water inlets-outlets that communicate with the water retaining channels.