Multifunctional rainwater collection, purification and recycling apparatus for buildings

The invention relates to multifunctional rainwater collection, purification and recycling apparatus for buildings. The apparatus comprises a bottom plate, a rotary stirring device positioned on the bottom plate, a frame device arranged on the rotary stirring device, an electric cylinder device positioned above the bottom plate, a purifying device arranged in the frame device, a filtering device positioned above the purifying device, and a piston device arranged on the filtering device. According to the invention, a piston continuously moves up and down, and then the flow rate of rainwater canbe effectively changed, so that impurities are effectively prevented from blocking filter holes, and the smooth purification is ensured; in addition, water periodically flows into the inner part, so that the sewage treatment effect can be improved; and the rainwater can be driven to fully flow when the rainwater is disinfected, so that the sterilization and disinfection effect on the rainwater isensured, the further treat