The invention provides a full-automatic soil condensed water measuring device and a using method thereof. The full-automatic soil condensed water measuring device comprises an automatic measuring system, a miniature seepage measuring instrument, an outer sleeve and an inner sleeve. The automatic measuring system comprises a base plate, miniature quality sensors, a power source, a wire, a single-chip microcomputer, an SD slot internally provided with an SD, an LED displayer and a data switching port connected with a PC. The multiple miniature quality sensors are connected together through the wire, and the wire extends out of the outer sleeve and is connected with the single-chip microcomputer. The single-chip microcomputer is connected with the SD slot, the LED displayer, the power source and the data switching port connected with the PC. The SD slot, the LED displayer and the data switching port connected with the PC are connected with the power source. The full-automatic soil condensed water measuring device has the advantages that the functions of automatic condensed water measuring, data storing and displaying and the like are integrated, cost is low, data measuring is convenient and accurate, a lot of vigor of researchers can be saved, and the device is suitable for ecological system soil condensed water measurement study in arid and semi-arid regions.