The utility model provides a quantitative extraction device for liquid, which comprises a container, a liquid inlet pipe, a liquid outlet pipe, a liquid inlet pipe, a liquid outlet pipe, a liquid inlet pipe and a liquid outlet pipe, an ITO working layer, wherein the ITO working layer is arranged in the container; the signal generator is used for generating a high-frequency signal; the input end and the output end of the signal generator are connected with the ITO working layer through the first wires respectively; the second wire is connected with the ITO working layer and the current detection unit; the input end and the output end of the current detection unit are connected with the ITO working layer through second wires respectively. The device has the advantages of accurate quantification, no pollution to extracted liquid and the like.