Self-flushing type membrane on-line cleaning device

The utility model provides a self-flushing type on-line membrane cleaning device which comprises a storage tank, a filtering and conveying device and a cleaning pipeline, wherein the storage tank is provided with a liquid storage cavity, the top end of the storage tank is provided with a dosing port, a water inlet pipe, a first water return pipe and a second water return pipe, and the bottom end of the storage tank is provided with a discharge pipe; and a cleaning piece is arranged in the storage tank. The filtering and conveying assembly is used for conducting pressure conveying on the medicine in the liquid storage cavity and filtering the medicine. The cleaning pipeline is respectively communicated with the liquid outlet and the water inlet pipe; a first cleaning water pipe and a second cleaning water pipe are arranged on the cleaning pipeline; the first water return pipe and the first cleaning water pipe are communicated with the ultrafiltration membrane group, and the second water return pipe and the sec