Water purifier with leakproof function

A water purifier comprising:

• a filter head, a flow channel control module, a housing, and a filter element;
• wherein:
• the filter head includes a water inlet port and a water outlet port;
• the flow channel control module is mounted in the filter head and includes a waterway board and a flow manifold arranged under the waterway board;
• the waterway board is fixed in the filter head;
• the waterway board is juxtaposed to the flow manifold;
• the waterway board is provided with a water flow channel;
• the water flow channel of the waterway board has a first end provided with a water inlet hole connected to the water inlet port of the filter head and a second end provided with a water outlet hole connected to the water outlet port of the filter head;
• the flow manifold is rotatable relative to the waterway board;
• the flow manifold is provided with a first passage and a second passage;
• the housing is hollow and has a first opening and a second opening;
• the first opening of the housing is connected with the filter head;
• the filter element is detachably connected with the flow manifold of the flow channel control module and is rotated in concert with the flow manifold;
• when the filter element is mounted on the flow manifold of the flow channel control module, the flow manifold is driven by the filter element and rotated relative to the waterway board to a first position where the first passage of the flow manifold is connected to the water flow channel of the waterway board, and the flow channel control module is switched to a first flow channel waterway mode (or filter mode);
• and
• when the filter element is removed from the flow manifold of the flow channel control module, the flow manifold is driven by the filter element and rotated relative to the waterway board to a second position where the second passage of the flow manifold is connected to the water flow channel of the waterway board, and the flow channel control module is switched to a second flow channel waterway mode (or replacement mode).