The invention discloses a combined geotextile. Each of two opposite edges of a main cloth layer is provided with a magic tape; and the magic tape is fixedly connected with the main cloth layer by knitting glass fibers. Two geotextiles fixed with the magic tapes can be rapidly and stably adhered at the construction site, the working efficiency of the construction site is improved, and the combined geotextile is suitable for the critical moment of fighting floods and providing relief. The glass fibers fixed between the magic tape and the main cloth layer have the characters of corrosion resistance, high strength, long service life and the like.