Raw ore wet-process pre-grading device applied to dense medium ore dressing

The utility model relates to the technical field of beneficiation screening, and discloses a raw ore wet pre-grading device applied to dense medium beneficiation, which comprises a grading device main body, and the grading device main body comprises a desliming screen, a lifting device, a primary dewatering screen, a pumping pressure conveying device, a cyclone and an electromagnetic high-frequency dewatering screen, a screen material output port of the desliming screen is connected with an input port of the lifting device, an output port of the lifting device is arranged over the input end of the primary dewatering screen, and a screen material output port of the primary dewatering screen is connected with the input end of the pumping pressure conveying device in a sealed mode through a connecting pipeline. The output end of the pump pressure conveying device is in sealed connection with an input port of the cyclone through a connecting pipeline, an electromagnetic high-frequency dewatering screen is arrange