The invention discloses a transformer substation or converter station accident handling cloud terminal remote support decision-making method and system. The method comprises the steps of A, starting resource uploading cloud terminal remote sharing at the accident handling moment, B, storing and updating information and resources relative to accident handling in a classified mode by setting up a database, and C, receiving initial handing results of a cloud server in a short message mode. The system comprises a local input unit, the cloud server and a remote output unit. According to the transformer substation or converter station accident handling cloud terminal remote support decision-making method and system, existing accident handling resources in a station are used, the cloud server is set up by developing the accident handling cloud terminal remote output unit support decision-making system, remote sharing is carried out on various resources, such as signals, site situations and various auxiliary analysis and monitoring tools, relative to the accident handling, an accident handling main line is guaranteed to be clear, and timeliness of the accident handling is guaranteed. Equipment inspection is comprehensive, omissions are avoided, an initiative reporting mechanism is formed, repeated reporting and repeated communication are avoided, and accident handling efficiency is improved.