The utility model discloses a slurry shield clay separation device which comprises a machine base arranged on a slurry box. A pressure reducing box for clay to be led therein is arranged above the machine base, a driving wheel located at the tail portion and a driven wheel located at the front end are arranged on the machine base and perform drive through chains respectively arranged between two ends of the driving wheel and two ends of the driven wheel, a plurality of scraping plates are installed between the two chains, and an electric motor driving the driving wheel to operate and a speed reducer are arranged on the machine base. The slurry shield clay separation device directly leads clay to the top end of the slurry box, the electric motor drives the driving wheel to drive the driven wheel to rotate through chain drive, meanwhile the scraping plates perform linear motion on the machine base with the chains and scrape off clay from the pressure reducing box, accordingly the clay is effectively prevented from blocking a screen of the separation device, construction efficiency is improved, and the slurry shield clay separation device is used in the field of shield devices.