A PK/PCK six-blade straight-blade turbine impeller, a radial flow impeller with high turbulent diffusion and shear force. When baffles are used, it can form an up-and-down circulating flow, with a wide range of operating speeds and viscosities. It is especially suitable for shear dispersion operations, and can also be used for general reactions, dissolution, suspension, heat transfer, emulsification, crystallization and other unit operations.