Water turbine main shaft sealing wear on-line monitoring device

The invention discloses a water turbine main shaft sealing wear on-line monitoring device, which comprises a support member, a waterproof member, a range finder and a reflective member, the waterproof member is arranged on the support member, the waterproof member is provided with a mounting chamber and an opening, the range finder is arranged in the mounting chamber and can emit laser to the opening, and the reflective member is arranged in the mounting chamber and is adjacent to the opening. The light reflecting part is suitable for being installed on the floating rod, the floating rod is arranged on the sealing part and extends in the vertical direction, the floating rod can move in the vertical direction and drive the light reflecting part to move in the vertical direction along with abrasion of the sealing part by the main shaft, and the light reflecting part is used for reflecting laser emitted by the range finder. The height of the sealing floating rod of the main shaft in the vertical direction is jud