To match the Antarctic krill continuous pumping fishing system, change the current situation of traditional Antarctic krill fishing with high damage and low value-added processing, improve the automation process of water separation and shipboard krill transportation, aiming at the problems of krill-water separation and transmission in the new continuous pumping system of Antarctic krill, and reduce the damage during continuous underwater pumping fishing and transportation, a krill-water separator with spiral conveying structure is developed, its separation efficiency, transportation speed, and other relevant parameters are studied according to the fluid model analysis. It is shown that the krill-water separator can meet the separation and transportation of Antarctic krill under the designing flow rate, without a large number of Antarctic krill accumulation and extrusion resulting in shrimp body damage, and also could realize the separation of shrimp water mixture under the variable flow rate of pumping and transportation by adjusting the rotation speed and inclination angle of the main body. The design can be scaled and arranged in parallel to meet the needs of Antarctic krill continuous pumping fishing vessels with different tonnage and layout, and can provide a reference for the practical application of krill-water separation.