Abstract: In order to compare the internal flow performance of hydraulic components and the influence of dishwasher type on head and hydraulic efficiency, the internal flow field of pump, spray arm and other components in two kinds of dishwashers were compared and analyzed based on the SST k-ω turbulence model with high precision. The results show that the innovation of the sink-type dishwasher combines the two-in-one structure of the volute and the spray arm to effectively eliminate the pipeline system. The sink-type dishwasher avoids the accumulation of filth in the pipeline, improves the dishwasher head, as well as increases the hydraulic efficiency by 2% than that of the embedded dishwasher. However, its innovative structure results in unfavorable flow phenomena such as the tip leakage vortex and axial vortex in the compound impeller of the pump. Therefore, its hydraulic model needs further optimization. Embedded dishwashers have an obvious phenomenon of ″big horse pulling a small cart″, and the flow passage components such as water pumps and additional flow channels need to be improved. The comparison of the hydraulic performance of the water pump in two dishwashers reveals the advantages and disadvantages of sink-type and embedded dishwasher design, which provides a reference for the innovative design of new dishwashers.