The invention relates to an outgoing line device of a transformer. The outgoing device comprises a voltage sharing ball and a sleeve, wherein a tail end of the sleeve is inserted into the voltage sharing ball, an insulation shielding paper cylinder is arranged at the periphery of the voltage sharing ball and is at least two layers of thin-paper cylinder small-oil gap structures partitioned by a support strip, the internal diameter of the insulation shielding paper cylinder is larger than the diameter of the voltage sharing ball and the maximum diameter of the sleeve, a lower end of the voltage sharing ball is connected with an insulation binding pipe, and a high-voltage leading-out line is outgoing from the middle part of a high-voltage winding, penetrates through an initial end of the insulation binding pipe after a wire is externally connected, passes through the voltage sharing ball and then is led out of the sleeve. The outgoing line device has the advantages of small required insulation distance, stability, high reliability, simple structure, short fabrication period and low fabrication cost.