A tubule of porous polypropylene fibre, which is usually used for water treatment, was applied to in-situ sampling of soil solution for the first time. With filtering pores (0.1~0.3 μm in aperture) on the walls, the fibre tubule was joined with an injector or a vacuum tube, thus forming a soil solution sampler. After the tubule was laid or inserted into the soil, the device was ready to continuously in-situ extract soil solution. The solution could be used directly for chemical analysis without the need for filtering, demonstrating that this is a simple practical in-situ soil solution sampling method. Based on the light absorption characteristics of dissolved organic carbon (DOC) in the UV spectrum, the UV absorbance of the soil solution at 254 nm was studied. A significant linear correlation was found between UV absorbance at 254 nm (UVA₂₅₄) and DOC concentration determined with the TOC method (DOC=38.84×UVA₂₅₄, n=37, R²=0.82), allowing quantification of soil solution DOC directly by determining UVA₂₅₄ and then multiplying it by the coefficient, 38.84. Compared with the complex oxidation-colorimetry and costly TOC methods, this method is quicker and more convenient. Besides, it is also applicable to estimation of DOC concentration in water.