Liquid level sensing detection device

The utility model discloses a liquid level sensing detection device which comprises a support cantilever, a group of sensors, a protection box and a transposition mechanism, the support cantilever is a hollow steel body, one end of the support cantilever is provided with a flange, the rear side of the protection box is fixed with the support cantilever through a support lug, the flange and a bolt, and the rear portions of the two ends of the bottom face of the protection box are respectively provided with a measuring port. And the group of sensors are fixed at the upper part in the protection box and are concentric with the two measuring ports respectively. Two sensors are arranged in advance, one sensor is used for use, the other sensor is standby, when one sensor is damaged or breaks down, the sensor can be rapidly replaced for use, the reliability of liquid level detection is improved, the replacement safety is high, meanwhile, the protection box and the transposition mechanism are designed, the standby se