The invention discloses a service configuration method and device for an intelligent transformer station. A user port of a built-in ONU (Optical Network Unit) of a power protector receives a service message, and then sends the service massage to an FPGA unit of the ONU; the FPGA unit identifies a type of the message, adds the message to a customized field according to a preset format when a preset dwell vessel item does not include the message type, and sends the message to a CPU port of the ONU; and an internal program of the ONU receives the message from the CPU port, determines whether the message is a message discovered by a new service according to the customized field, and if YES, determines information of the new service according to the message, and the information of the new service is used to configure the new service. According to the method and device, the problems that configuration during onsite construction, reconstruction and upgrade of the transformer station is tedious and a system is not friendly to maintenance staff of the transformer station are solved.