This patent pertains to a filtration filter designed to separate solid particles from a liquid in the target material, as well as a filtration device and filtration purification system that includes this filter. The invention features:

• A mesh filter member made from a woven mesh fabric, formed to a certain length with a through-structure on both ends, and having a diameter-expanded end structure created through hot air molding on one end.

• A spring support inserted inside the mesh filter member, functioning as a support for the mesh filter. It has a spring diameter expansion end that fits into the diameter-expanded end structure on one end and a spring-tightening end on the other.

• A fastening fixture that secures the other end of the mesh filter member by folding it inward and inserting it into the inner side of the spring-tightening end of the spring support, pressing it tightly against the inner circumference, thus providing a durable filtration filter.

This filtration filter, with its structure, ensures and enhances airtightness during use, thereby improving processing efficiency for filtration or purification from the target material. It also proposes a filtration device that houses the filter within, which is easy to disassemble and assemble, and allows the entire filter to be easily removed for cleaning when necessary. Additionally, a filtration purification system that includes this filtration device is proposed.