The utility model discloses a ship lock miter gate waterproof absolute opening on -line monitoring device, the utility model relates to gate absolute opening monitoring technical field. The ship lock miter gate waterproof absolute opening on -line monitoring device, including moving ruler, static magnetic pointer and miter gate, moving ruler includes arc slot,
magnetism plate and PCB array, and PCB array sets up in the inside of arc slot, and
magnetism plate sets up in the lower surface of arc slot, and PCB array includes PCB board, and the outer surface of PCB board is provided with hall device array and controller, and static magnetic pointer includes support, angle code and permanent
magnet, and angle code is symmetrically arranged in the both sides of permanent
magnet, the utility model discloses non -contact means, installs the sensor on the gate, and the absolute opening information of gate is obtained through the method of
direct monitoring.