The utility model provides a guide sleeve for stabilizing a drilling tool of a rotary drill rig, and relates to a guide sleeve. The guide sleeve comprises an upper cover (1), an inner ring (4) and an outer ring (5), wherein the inner ring (4) is arranged inside the outer ring (5); an upper cover (1) is arranged at the upper end between the inner ring (4) and the outer ring (5); a plurality of cylindrical rollers (3) are separately and uniformly arranged in a gap formed between the middle part of the inner ring (4) and the middle part of the outer ring (5); a steel ball (6) is arranged between the lower part of inner ring (4) and the lower part of the outer ring (5); and an upper sealing element (2) is arranged at the upper part between the inner ring (4) and the outer ring (5), and a lower sealing element (7) is arranged at the lower part between the inner ring (4) and the outer ring (5). The guide sleeve has the advantages that the drilling tool stabilization is realized; meanwhile, a gap between a drill pipe and a platform is filled; and the goals of protecting the drill pipe and blocking dust are achieved.