In order to improve the intermittent operation efficiency of supercritical fluid extraction, continuous extractor of piston bin chain was designed which moved Inlet and discharge operations outside of solvent extraction process to realize the continuous extraction. With the study on different combination of the single, double O-ring and v-shaped dust block ring, the curve of different for dynamic seal pressure, leakage and wear trip were summarized. The effectiveness of the seal and wear trip was confirmed by using the simulation analysis of the O-ring contact reliability. Moreover, the extractor of different components in succession was also designed for fractional extracts and the specific process was put forward.