Rainwater collection and storage system for building roof drainage

The invention discloses a rainwater collection and storage system for building roof drainage, and relates to the technical field of house rainwater collection, the rainwater collection and storage system comprises a drainage pipe and a conveying pipe arranged at the end of the drainage pipe, and further comprises a filtering module arranged at the end joint of the drainage pipe and the conveying pipe; the water storage tank is connected with the conveying pipe, and a mounting plate is fixedly connected to the water storage tank; the fine filter plate is arranged in the water storage tank, and a cleaning assembly is arranged in the water storage tank. Through cooperation of the above structures, collected rainwater can be doubly filtered, the surface of a fine filter plate can be cleaned while the rainwater is collected and filtered, the situation that tiny impurities in the rainwater after primary filtration block the fine filter plate is avoided, and the rainwater collection and filtration efficiency is impr