Water level sensor as well as water container and beverage dispenser comprising same

The invention discloses a water level sensor as well as a water container and a beverage dispenser comprising the same. The water level sensor comprises one or more metal electrodes, one end of each metal electrode is exposed as a detection end, and the other end of each metal electrode is fixed in an insulating fixing piece and is connected with a signal output circuit in the insulating fixing piece; the signal output circuit is connected with a signal output wiring harness or a radio frequency wireless monitoring circuit. The water level sensor is used for devices with liquid level measurement and control, such as a water container and a beverage dispenser, and is combined with a mapping capacitor and a set change excitation signal such as a square wave, a pulse or an alternating signaland the like generated by computer control; the defects of a magnetic levitation ball dry reed sensor can be overcome, the lowest water level can be detected, water can be completely pumped without remaining water, the proble