The utility model discloses a rotating disc type continuous liquid adding device, belonging to the field of rare earth extraction technology. The rotating disc type continuous liquid adding device has the technical key points that the device comprises a box body, wherein a liquid storage tank is arranged at the bottom of the box body, and a liquid inlet pipe communicated with an external liquid feeding source is arranged on the side wall of the liquid storage tank; a liquid receiving groove is arranged on the side wall of the box body above the liquid storage tank; a liquid outlet pipe is arranged on the side wall of the liquid receiving groove; a rotating shaft is positioned in the middle of the box body, and the outer end of the rotating shaft is connected with a driving device; the rotating shaft in the box body is provided with a rotating disc which is evenly distributed with a plurality of liquid taking mechanisms; liquid taking holes of the liquid taking mechanisms rotate along with the rotation of the rotating disc and are sequentially immersed into the liquid storage tank; and the liquid taking holes of the liquid taking mechanisms are positioned above the liquid receiving groove. The utility model aims at providing the rotating disc type continuous liquid adding device which has simple and convenient structure as well as continuous, stable and accurate liquid adding, and is used for rare earth extraction and separation.