Purifying device used for processing dairy products and cleaning method

The invention discloses a purifying device used for processing dairy products and a cleaning method. The purifying device comprises a filtering box, a stirring machine and a main control table, a pressurizing pump is arranged on the upper portion of the filtering box, a liquid feeding pipe is arranged on one side of the pressurizing pump, a coarse filtering membrane is arranged below the liquid feeding pipe, a microfiltration antibacterial membrane is arranged below the coarse filtering membrane, an ultrafiltration membrane is arranged on one side of the coarse filtering membrane, a content detector is arranged on one side of the ultrafiltration membrane, a reverse osmosis membrane is arranged on one side of the content detector, a wastewater treatment device is arranged below the reverseosmosis membrane, a circulating pipeline is arranged above the reverse osmosis membrane, a conveying pipeline is arranged on one side of the reverse osmosis membrane, the stirring machine is arrangedat one end of the conveyin