Abstract: 9Cr heat-resistant steel is a critical material for high-temperature steam components in thermal and nuclear power plants. Its welded joints generally face Type IV creep cracking during long-term service, significantly reducing the device service life. Suppressing Type IV creep cracking to extend creep life is crucial for the safe application of 9Cr heat-resistant steel. Based on Chinese and international related research, the microstructural evolution rules of creep-susceptible zones during welding and post-weld heat treatment were systematically outlined, and the research status of creep cracking mechanisms of 9Cr heat-resistant steel welded joints was summarized. The results indicate that the prior austenite grain size and precipitate characteristics in the welded joints are key microstructural factors determining their creep properties. Based on this, the research progress on enhancing the creep life of 9Cr heat-resistant steel welded joints was systematically expounded from the aspects of base metal alloying element regulation, initial microstructure design, welding process optimization, and post-weld heat treatment strategy adjustment. Finally, future research directions were prospected.