Automatic drainage mechanism and rainwater regulation and storage facility

The utility model relates to the technical field of garden construction, in particular to an automatic drainage mechanism and a rainwater regulation and storage facility, which comprise a switch component which comprises an execution component, a self-locking component arranged at one end of the execution component, a mounting component arranged on the outer side of the execution component and a matching component arranged in the mounting component, the force application assembly is arranged at the top end of the execution assembly, the execution assembly comprises a base, a pressure plug and a pull rod, the pressure plug is arranged above the base, the pull rod is arranged at the top end of the pressure plug, when the water level of the reservoir reaches a certain position, a buoyancy ball pulls a valve piston to be opened, and stored water is automatically discharged; after the water level reaches a certain position, the valve piston is closed to continue to store water, the filtering assembly, the reservoi