The present invention relates to an apparatus for measuring unsaturated soil water content, and by collecting soil samples to accurately measure the water quality under various pressure conditions, by changing the unsaturated permeability coefficient and strength of cut and fill slope according to rainfall Prediction can verify the stability of the soil surface in advance, and in particular, it predicts the collapse of the soil slope of railroads and regulates the operation of trains to provide unsaturated soil water content measuring devices that can contribute to securing operational safety of railway traffic. There is that purpose. The present invention to achieve the above object, the pressure extractor is formed with a chamber therein; An upper filter body made of a porous material having micropores having a size smaller than a particle size of the soil sample, and disposed inside the chamber to partition the upper and lower parts into a sample chamber and a lower chamber; A lower filter body formed of a porous material having micropores of a size through which air and water can pass, and installed on an upper surface of a soil sample accommodated in the sample chamber and partitioning an upper space into an air chamber; A water supply means connected to the lower chamber of the pressure extractor and supplying water through the lower chamber to saturate the upper filter body, the lower filter body and the sample; Air supply means connected to the air chamber of the pressure extractor and supplying air pressurized to the sample by supplying pressurized air through the air chamber; Pressure regulating means for regulating the pressure of air supplied by the air supply means; And a pressure detecting means for detecting a pressure in the pressure extractor lower chamber due to the load of the air supply means.;Unsaturated soil, water characteristics, pressure extractor, pneumatic load, pressure detection means
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