Abstract: A connection structure for a filtration device, which relates to the field of filter technology, includes a main shell body, a mounting section and a switch section respectively assembled at two ends of the main shell body, and an installation section. When the switch section is toggled in one direction, the switch section drives the installation section to rotate and be inserted into a mounting hole on a refrigerator, an inlet and an outlet are correspondingly connected to a refrigerator pipeline, and water flows through the filtering component to filter out impurities. By using the above technical solution, the connection failure and water leakage issues are prevented and offering simple connection operation and quick assembly.