Tool and method for replacing sealing element of transformer

The invention relates to the technical field of transformer maintenance of an electric power system, in particular to a tool and method for replacing a sealing element of a transformer. Comprising a transformer and further comprises a storage box, a vacuum pump and a buffer tank, the buffer tank is fixedly installed in the storage box, and one end of the buffer tank is connected to an exhaust pipeline and used for balancing air pressure in an oil way of the transformer; and the monitoring end is arranged in the storage box, the monitoring end is electrically connected with the vacuum pump, and the monitoring end is used for controlling electrification of the vacuum pump and monitoring pressure in the buffer tank and a transformer oil way. According to the tool for replacing the sealing element of the transformer, under the condition that the transformer does not discharge transformer oil through a vacuum oil extraction method, high-voltage and low-voltage supporting column sealing gaskets are replaced, oil do