The utility model discloses a liquid level depth sensing measurement device and a probe used for measuring the liquid level depth. The liquid level depth sensing measurement device comprises a probe, a scale line, leads, a sensor light and a power supply device, wherein scales are marked on the scale line and are used for indicating the falling length of the scale line; the leads include an anode lead and a cathode lead, the anode lead is electrically connected to an anode sensor, and the cathode lead is electrically connected to a cathode sensor; and the sensor light is used for indicating whether the probe reaches the liquid level or not. The probe comprises a cap, a fixator, the anode sensor, the cathode sensor and a buoy, wherein a plurality of water inlets are formed at the front end of the cap; a through hole is formed in the fixator; one of the anode sensor and the cathode sensor penetrates through the through hole of the fixator and can move up and down in the through hole; and the buoy is connected with the sensor which penetrates through the through hole of the fixator, and the liquid buoyancy can enable the buoy to drive one sensor to move to the other sensor. The device provided by the utility model has the advantages that the operation is simple, and when the probe is contacted with the water level, the sensor light is turned on automatically, so that people do not need to see the water level.