The invention provides a circulating drainage device. The circulating drainage device comprises a casing, a circulation motor and a drainage motor, wherein a filtration chamber, a circulation pump chamber and a drainage pump chamber are formed in the casing; a water flow inlet, a first outlet and a second outlet are formed in the filtration chamber, the first outlet is communicated with the drainage pump chamber, and the second outlet is communicated with the circulation pump chamber; the circulation motor is connected with the circulation pump chamber; the drainage motor is connected with the drainage pump chamber. The circulating drainage device is characterized in that a separation wall is arranged in the filtration chamber to divide a space in the filtration chamber into a first chamber connecting the water flow inlet and the first outlet and a second chamber connecting the second chamber, filtering holes are formed in the separation wall, and the first chamber and the second chamber realize fluid communication through the filtering holes in the separation wall. In the water circulation process, outside water firstly enters the first chamber and then enters the second chamber through the filtering holes in the separation wall, water enters the circulation pump chamber from the second water outlet, that is, water entering the circulation pump chamber must be filtered by the separation wall, and accordingly, impurities in the water are collected on the separation wall. In the drainage process, the outside water can scour the filtration wall and takes the impurities into the drainage pump chamber, so that the impurities are discharged out of a washing machine and the automatic cleaning function of the separation wall is realized. Accordingly, a user doesn't need to manually clear filtered impurities in the circulating drainage device.