The invention relates to a communication management device for a transformer substation online monitoring system. The communication management device adopts a distributed architecture, and comprises a management CPU (Central Processing Unit) board card, a communication interface board card and a bus board card, wherein the management CPU board card is responsible for upward IEC61850 communication and the management of an internal database, the communication interface card board is used for achieving the data collection of various kinds of non-IEC61850 intelligent devices, and seamlessly converting the collected various kinds of non-IEC61850 protocol data into IEC61850 protocol data, and the bus board card is used for providing an internal high-speed bus for the signal interconnection between the management CPU board card and the communication interface board card. The communication management device is applied to performing data protocol conversion among different online monitoring systems of the transformer substation, and achieving the seamless access and intelligent control and management of the online monitoring data of the intelligent power device.