The invention provides a device and a method for measuring a
moisture characteristic curve in the soil dehumidification and
moisture absorption processes. The device comprises a
cutting ring, two tension meters, a
measuring instrument, a
ceramic plate and a first vessel, wherein two open pores positioned at different heights of the side wall are formed in the side wall of the
cutting ring, and thecutting ring sleeves the exterior of soil to be measured; the two tension meters are configured to be applicable for being inserted into soil through the two open pores respectively and measuring thetension of soil; the
ceramic plate is placed in the first vessel for supporting the
cutting ring; the first vessel is configured to keep water inside the first vessel and the upper end face of the
ceramic plate to be at the same height all the time when the
moisture characteristic curve in the soil dehumidification and
moisture absorption processes is measured; the
measuring instrument is configured to measure and
record the weight of the cutting ring and the weight of soil corresponding to a plurality of preset moments, or the weight of the cutting ring, the weight of the first vessel, the weight of the ceramic plate and the weight of the soil, and
record the displayed numbers of the two tension meters corresponding to the preset moments. The device and the method can be used for measuring the moisture characteristic curve corresponding to the soil dehumidification and
moisture absorption processes.