Disclosed in the utility model is a heat shrinking tube. The axial shrinkage of the heat shrinking tube is -10% to -40%; and grooves in axial penetrating modes are distributed at the inner wall of the heat shrinking tube. Because the heat shrinking tube provided by the utility model has the special axial shrinkage and the grooves in axial penetrating modes are distributed at the inner wall, when the coated object has the irregular shape or has a large bending angle, the heat shrinking tube and the coated object can be contacted tightly when the heat shrinking is carried out, thereby effectively solving problems of shrinkage wrinkling and plumping.