Measuring system for accurately measuring liquid level of pit

The invention relates to the technical field of power plant safety facilities, and discloses and provides a measuring system for accurately measuring the liquid level of a pit, which comprises a tank body and an ultrasonic liquid level meter for measuring the liquid level in the tank body; the purging device is used for removing water vapor on the surface of the ultrasonic liquid level meter; the data acquisition module is used for acquiring water vapor quantity data on the surface of the ultrasonic liquid level meter; and the controller is electrically connected with the data acquisition module and the purging device and is used for controlling the start and stop of the purging device. The ultrasonic liquid level meter is arranged at the upper end of the tank body, the purging device is mounted on the surface of the ultrasonic liquid level meter, and water vapor on the surface of the ultrasonic liquid level meter is cleaned by controlling the purging device, so that the problem that water vapor is generated