The invention relates to a digital liquid level sensor, belonging to the technical field of measurement. The digital liquid level sensor is characterized in that the sensor is an integral throw-in-type digital liquid level sensor with an elastic cavity, the sensor consists of a sensing part, a shell and a transmitter 15, and the sensing part (see attached drawing 1) consists of a rubber molded box 1, a magnetic core 2, a coil 3, a spring 4 and an adjusting screw 5, wherein the rubber molded box 1 is a rubber elastic cavity which can be extended and retracted vertically, and the transmitter 15and the sensing part are installed together. When being used, the digital liquid level sensor is directly thrown into liquid to be detected and is not required to be installed. Moreover, since the sensor outputs pulse digital signals, the sensor can be directly matched with subsequent digital processing circuits such as a computer, a single-chip microcomputer and the like. The digital liquid level sensor has the advantages of low manufacturing cost, simple range adjustment and convenience in use, is suitable for all fields of industry and agriculture and can be used for measuring the liquid level of all kinds of conductive and nonconductive liquid materials.