A production method for a polypropylene spun-bonded needle-punched geotextile mainly includes the following steps: polypropylene chips are conveyed into a screw extruder and extruded out, the melt enters a spinning manifold via a filter, and is measured and extruded into filaments by a spinneret plate, the filaments are cooled by cross wind, drafted by duct airflow, then separated, swayed and formed into a web on a lapper, the web is outputted to a needle machine and needled to be bound, and after tension is adjusted, the web is trimmed and rolled, so that the polypropylene spun-bonded needle-punched geotextile is formed. Various processes after spinning, such as bundle stretching, rolling, drying, shaping, cutting off, packing, unpacking, blending, carding and web forming, are dispensed, consequently, the production process is greatly shortened, the production cost is lower, and the production efficiency is higher; the product has higher strength and better uniformity, thermal shrinkage and various indexes are more stable, and the product is incomparable with polypropylene staple geotextile and the like.