Liquid level detection device

The invention discloses a liquid level detection device. The liquid level detection device comprises a signal receiving and transmitting unit, a signal conversion unit and a signal detection unit, wherein the signal receiving and transmitting unit is coupled with the signal conversion unit and is used for providing different voltage input signals for the signal conversion unit; the signal conversion unit is coupled with the signal receiving and transmitting unit and the signal detection unit respectively and is used for receiving the voltage input signals transmitted by the signal receiving and transmitting unit; a detection circuit is coupled with the signal conversion unit and the signal receiving and transmitting unit respectively and is used for detecting a voltage value of the signalconversion unit, so that the signal receiving and transmitting unit judges whether the liquid level in a current target container reaches a preset position or not according to the voltage value. According to the device disclo