The utility model discloses a water level measuring system of a GBL type water-immersed scraper submerged chain conveyor, and relates to the technical field of water level measurement of submerged chain conveyors. The utility model aims to solve the problems that the water level measuring system of the slag trough of the existing submerged chain conveyor is often blocked and cannot work normally,and the risk of maintenance work is high. The utility model relates to a water level measuring system of a GBL type water immersion type submerged scraper conveyor. The device comprises a floating ball liquid level sensor and a water tank, the submerged chain conveyor slag pool is communicated with the water tank, a filter screen is arranged on a passage between the submerged chain conveyor slag pool and the water tank, a floating ball of the floating ball liquid level sensor is arranged in the water tank, and the floating ball liquid level sensor measures the liquid level of liquid in the water tank through the floating ball. The water level measuring device is suitable for measuring the water level of the slag groove of the submerged chain conveyor.