Flat membrane support plate

A flat membrane support plate, comprising:

• a connection portion, configured to connect a diaphragm to the flat membrane support plate in a sealing manner;
• wherein the connection portion is arranged at a periphery of the flat membrane support plate, and provided with at least one water outlet;
• a honeycomb structural portion, arranged on the flat membrane support plate in an area enclosed by the connection portion;
• wherein the honeycomb structural portion is provided with a first flow channel for communicating with an interior of the entire honeycomb structural portion and communicating the honeycomb structural portion with the water outlet, and a hollow area of the honeycomb structural portion occupies 30-70% of an entire area of the flat membrane support plate;
• and
• a support portion, configured for reinforcing the honeycomb structural portion and arranged between the honeycomb structural portion and the connection portion.