In recent years, with the frequent occurrence of various emergencies, which have brought huge losses to the national economy and people's production and life, the state also attaches great importance to the emergency handling of emergencies. Emergency mapping has always been an important technical support for emergency disposal, and its development and improvement play a vital role in reducing the losses caused by various emergencies. At present, emergency mapping still has great room for improvement in terms of emergency response rate, accuracy and quality. As a cross-era technology, 5G technology has important characteristics such as high speed, large number of connections and low delay. It is applied to the field of emergency mapping to improve the service level of emergency mapping from three aspects of data collection, data processing and information service, so as to deal with emergencies and reduce national losses.