The invention relates to a large geotextile sandbag used for near-shore deep-groove bank slope protection and a throwing device of the sandbag. The single body of the large geotextile sandbag is 10m long, and the diameter of the single body is 1.2m; the sandbag is in the type of a cylinder without side seams, the two sides of the sandbag are sewn with an overseam double-thread method, and the bag cloth is made of high-strength polypropylene; three holes with the diameter of 10cm are formed in the same side of the bag body. The large geotextile sandbag is durable in use, easy to throw and position and remarkable in protection effect. The throwing device used for the large geotextile sandbag comprises a support, a turning plate arc-shaped groove, a crowbar and other components and is mainly technically characterized in that a sandbag throwing turning plate is an eccentric arc-shaped groove, the surface of the turning plate is polished to be smooth, and drainage holes are formed in the bottom of the groove. The throwing device can avoiding depending on an external power source, the work face is reduced, energy and project investment are saved, construction efficiency is improved, and moreover the throwing device is convenient to use and high in comprehensive efficiency and provides a technological guarantee for completing large-scale throwing and bank protection operation in a short time.