Abstract: The research progress of welding cold cracking of ship steel is summarized, the effects of diffusive hydrogen, hardening structure and tensile stress on the formation of cold welding cracks steels analyzed, the formation mechanism of welding cold crack based on three factors introduced, the control methods of cold crack in welding process of hull structural steel based on the ideas of welding material improvement, welding process control, base metal weldability improvement and low matching welding summarized, and the research emphasis of welding cold crack prospected.