At present，the opening and closing position control of reversed tainter valve of ship lock mainly depends on the chain drive opening detection device and proximity switch.Since the reversed tainter valve of ship lock is frequently opened and closed under high water head，when the connecting shaft and the shaft sleeve of the boom are worn，the opening and closing position error of the reversed tainter valve will gradually increase，causing the over-closing phenomenon of the reversed tainter valve，and then causing damage to the valve body，water stop and bottom sill embedded parts of the reversed tainter valve.Aiming at this problem，this paper studies the operation state detection scheme of the reversed tainter valve of the ship lock by improving the accuracy of the opening and closing control system.The problems existing in the position control system of the reversed tainter valve are analyzed，and the angle information of the opening and closing position is detected by installing the inclination sensor inside the valve body of the reversed tainter valve，which improves the control accuracy of the opening and closing position.In 2021，the installation，construction and testing of the operating state detection device were implemented at the right-charge reversed tainter valve of Gezhouba No.3 ship lock，which verified the technical feasibility of the online detection system for the operating state of the reversed tainter valve and the advanced detection level.