The invention provides special secondary interface equipment for an emergency transformer substation, and belongs to the field of transformer substations. The secondary interface equipment is arrangedin the emergency transformer substation; and when temporary power supply is needed, the emergency transformer substation communicates with an original transformer substation by the secondary interface equipment. The built-in secondary interface equipment is used to communicate with the original transformer substation having a power supply failure in the emergency transformer substation, and communicates with a dispatching center based on acquired monitoring data in the original transformer substation, so that the dispatching center timely redeploys power supply lines in the emergency transformer substation based on acquired information to meet requirements of timely power supply, failure data points of the original transformer substation are replaced with part of interval data points of the emergency transformer substation to rapidly replace data points failed in dispatching communication and ensure consistency of the dispatching communication, and influence of use of the emergency transformer substation on dispatching is reduced.