The utility model relates to a water seal device for a pellet circular cooler, which is characterized in that a strengthened sealing groove is included, and the strengthened sealing groove is filled with liquid; the lower end of a secondary dust emission partition board is inserted in the liquid stored in the strengthened sealing groove; and special-shaped special highly heat resistant cast steels with one end extending downwards are installed on the right angle sections of an inner ring and an outer ring of a receiving device. The utility model has the advantages that compared with the sand sealing groove, the service life is prolonged by eight times, the air tightness is greatly enhanced, the utilization ratio of hot air is improved, the sealing plate does not deform under the conditions of high temperature, the scene environment is greatly improved, the quality of the finished product pellets is improved, the waste of the water sources is avoided owing to the automatic water supply and the balanced self-flowing drainage, the utilization ratio of the water is improved, the service life of the sealing plate and the refractory material is prolonged, and 400,000 yuan can be saved annually; and the material cost and the benefit are saved due to the improvement of the operating efficiency of the equipment.