The invention discloses a fatigue break feeding machine for fixed workpiece fatigue load circumferential cyclic loading. A loading frequency regulating and controlling mechanism comprises a main shaftand a rotating chuck connected with the main shaft; a fatigue load loading mechanism comprises a first servo motor and a lead screw which are arranged on the rotating chuck, the first servo motor drives the lead screw to rotate, a nut is vertically installed on the lead screw, and a feeding die is movably installed on the nut; a workpiece clamping mechanism comprises a feeding opening and a discharging opening, the locations of the feeding opening and the discharging opening are separately provided with clamping assemblies, second servo motors of the clamping assemblies drive two-way lead screws to rotate, and each two-way lead screw is provided with two clamping pieces. A fatigue break principle is used, so that multiple fatigue crack sources are generated at the prefabricated stress gaps of rod and tube materials to enable the crack to quickly extend, and quick feeding of the rod and tube materials is achieved; and sections are kept smooth, end portions are free of deformation, wherein the fatigue load loading mechanism controls the displacement of the lead screws by the servo motors, and radial real-time adjustment of displacement amount is achieved.