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This invention discloses a mixing impeller and a pulping device. The mixing impeller includes an impeller body with a cavity extending from its bottom end towards its top end. A flow-through hole communicating with the cavity is formed on the side wall of the impeller body. The impeller body can rotate around its own axis. During rotation, solid material is conveyed from top to bottom along the external flow channel of the impeller body; liquid material is conveyed from bottom to top through the cavity of the impeller body. The liquid material flows through the cavity and exits through the flow-through hole on the side wall of the impeller body, mixing with the solid material. The cavity and flow-through hole on the impeller body raise the liquid level, thereby increasing the mixing interface height between the solid and liquid materials and further improving the mixing efficiency.