The invention provides a unidirectional high-strength woven geotextile, and belongs to the technical field of industrial textiles and fabric. The unidirectional high-strength woven geotextile includes first wrap yarn, second wrap yarn and weft yarn and is woven by the adoption of a plain weave structure. The unidirectional high-strength woven geotextile is characterized in that the array of the second wrap yarn and the first wrap yarn is 1:1 or 1:2, the cross section of the second wrap yarn and the cross section of the second weft yarn are round, the yarn density of the first wrap yarn is greater than that of the second wrap yarn, and the diameter of the cross section of the first wrap yarn is greater than that of the cross section of the second weft yarn; twisted yarn of polyester industrial filaments or twisted yarn of polypropylene industrial filaments or twisted yarn of polyamide industrial filaments is adopted in the first wrap yarn, polypropylene monofilaments are adopted in the second wrap yarn, and one of the polypropylene industrial filaments and the polypropylene industrial filaments or the polyamide industrial filaments is adopted in the weft yarn. The unidirectional high-strength woven geotextile has the advantages of being low in warp-direction elongation at break and high in load at certain elongation of 5%, and the problems are solved that geotextiles of soft foundation engineering are low in unidirectional tensile strength, low in modulus, high in elongation at break and poor in stress-strain relationship.