The invention relates to the technical field of engineering supporting, in particular to a pressing seam type friction type constant-resistance anchor rod. By means of the anchor rod, the technical problems that in the prior art, the ultimate tensile length of an anchor rod is small, function overload failure occurs easily, and the flexible supporting capacity is not achieved are solved. The anchor rod structurally comprises a sleeve, a rod body, a tray and a pressing block. The rod body comprises an entity segment, a constant-resistance segment, a conical segment, a friction resistance segment and a free segment from top to bottom. The entity segment is of a cylindrical solid structure. The side walls of the constant-resistance segment, the conical segment and the friction resistance segment are provided with gaps with the same width from top to bottom in the axial direction. The outer diameter of the constant-resistance segment is larger than that of the friction resistance segment. The outer diameter of the axial section of the rod body gradually diseases continuously and is in transition to the outer diameter of the friction resistance segment from the outer diameter of the constant-resistance segment in the axial direction through the conical segment The sleeve comprises a rough-hole segment, a conical-hole segment and a thin-hole segment and is matched with the rod body in inner diameter. The anchor rod is not damaged when a surrounding rock is greatly deformed, larger displacement of the rod body is allowed so as to adapt to deformation of the surrounding rock, the surrounding rock deformation energy can be continuously absorbed, and the stability of the surrounding rock is maintained.