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The hydrogen-electric coupling system is an important and indispensable part of a new-type power system， and its safety is a prerequisite for large-scale application. The hydrogen-electric coupling system is studied， and the accidents in key hydrogen-related equipment are summarized and investigated.Furthermore， fault tree analysis （FTA） is used for safety risk evaluation on the combustion and explosion of the hydrogen-electric coupling system caused by hydrogen leakage. The study shows that hydrogen storage and compression equipment is prone to safety accidents， and design defects， sealing， and operation errors are major causes of hydrogen accidents. The fault tree analysis shows that there are five ways to effectively prevent the hydrogen-electric coupling system from fire or explosion due to hydrogen leakage. The importance of the hazard sources and basic events of the system obtained from the study lays the foundation for developing safety protection measures.