Liquid level measuring device

The utility model relates to a liquid level measuring device which comprises a feed liquid barrel. The liquid level measuring device is characterized in that the feed liquid barrel is communicated with one end of a vapour-water communicating pipe; the other end of the vapour-water communicating pipe is communicated with a measuring tube; a carbon-point rod is arranged in the measuring tube; and the data output end of the carbon-point rod is connected with a processing control device. As the carbon-point rod is not in contact with the tube wall of the measuring tube, a capacitor is formed between the carbon-point rod and the measuring tube, and the feed liquid can be effectively and accurately measured. By dint of the cooperation of a programmable controller which serves as the processing control device, an effective warning to each condition is respectively given while the liquid level is measured, so that the measurement and the monitoring are conveniently realized.