The invention discloses a flat-plate type extraction centrifuge, including a flat plate base, an outer shell, a revolving drum, a motor, a transmission device and an inlet pipe, wherein the outer shell is fixed to the flat plate base, the upper end face of the outer shell is detachably provided with a top cover, the inlet pipe is arranged on top cover and extends into the revolving drum, the upperend of the revolving drum is open, ribbed plates are uniformly distributed on the inner wall of the revolving drum, the upper end of the revolving drum is provided with a weir plate flange, the center hole of the weir plate flange is a light phase discharge hole, the side wall of the revolving drum is provided with a heavy phase discharge hole, the revolving drum is rotatably mounted on the flatplate base, the inner wall of the outer shell is provided with a light phase collection trough, the light phase collection trough extends to the lower side of the weir plate flange, a light phase collecting cavity is formed between the inner wall of the outer shell, the inner wall of the light phase collection trough and the top cover, the light phase collecting cavity is connected with a light phase discharge tube, a heavy phase collection cavity is formed between the inner wall of the outer shell, the flat plate base, the revolving drum and the outer wall of the light phase collection trough, the flat plate base is provided with a heavy phase discharge tube, and the heavy phase collection cavity communicates with the heavy phase discharge tube. The centrifuge can be quickly disassembledand assembled, and the production efficiency is high.