A multi-section bag-type compression type anchor bolt is used for reinforcing and protecting of foundation pits, slopes, tunnels and underground engineering in various complex formations, which comprises an anchor bolt body, wherein a tubular fabric bag is coated at the outside of an anchoring segment of the anchor bolt body, the diameter of the fabric bag is 5 centimeters to 10 centimeters longer than that of a drilling hole of the anchor bolt, the lower end port of the fabric bag arranged at the end of the guide head and the anchor bolt are bound up tightly by a lacing, while an upper end port of the fabric bag, an injection pipe inserted in the fabric bag and the anchor bolt body are bound up tightly by a lacing, cement grout and cement mortar can be injected via the injection pipe in the fabric bag. The multi-section bag-type compression type anchor bolt is simple in structure, and is capable of suppressing loss of cement mortar, increasing full degree and completeness of a grouted matter, reinforcing radio extrusion force, thereby obviously increasing a pulling resistance of a unit anchorage length of the anchor bolt and strengthening the anchoring effect. Further, the multi-section bag-type compression type anchor bolt is particularly for the anchorage engineering of complex formations such as a soft soil layer with free water, a rock formation with joint fissure or a solution rock formation and the like.