Abstract: Abstract: Aiming at the problem that the front four-bar caving coal transition support is prone to uneven load on the front and rear columns and the caving coal transition support is likely to cause fatigue instability and failure of the main bearing structure under the impact load. Taking the top beam and base of the main structural parts of the anti-four-link caving coal transition support as the research object, the three-dimensional model of the top beam and base was established using SolidWorks, and the fatigue life analysis of the components was performed using the ANSYS Workbench finite element software. By analyzing the life cloud diagram, damage cloud diagram and fatigue sensitivity characteristic curve of the top beam and base, the maximum cumulative fatigue damage of the top beam and base and the parts prone to fatigue failure are obtained. The design research results show that the designed top beam and base have a small amount of deformation under load, and the maximum fatigue cumulative damage ratio of the top beam and base is less than 1, which satisfies the structural design life of each part of the transition bracket is less than the usable life.