Abstract: The research progress on reheat cracking of welded joint of heat-resistant steel pipe for thermal power plant boiler is summarized from the aspects such as reheat cracking characteristics, formation mechanism, and preventive measures. However, the research and application of reheat cracking is not very clear and unitary, and the explanation for the reheat cracking phenomenon of some materials is not enough, even contradictory. In the future, the research on reheat cracking of the welded joint of heat-resistant steel pipe for power plant boiler should be focused on the material composition and performance optimization, precipitation, failure model, high resolution microstructures, etc. Meanwhile, the reheat cracking evaluation system should be established to realize the prediction and evaluation of the reheat cracking.