The invention relates to a door access management method for unattended transformer station. According to the method, a worker who wants to go into an unattended transformer station sends an application to a server by a smart phone; then the server forwards the application to the mobile phone of a corresponding manager; after the application is approved, the result is sent to the server through a command; if the server judges that the applicant has reach the door of the transformer station in an accessible time section, the server sends the work command that allows the entrance to a corresponding on-site access control facility, the on-site access control facility starts the operation function of a remotely-controlled door, the smart phone can be used to open the remotely-controlled door, and the remotely-controlled door will automatically close after a preset opening time is reached. The intelligent door access management can be achieved by the provided method, the entrance of workers can be traced and managed, and the shortages of artificial operation for opening the door are overcome.