The invention relates to a transportation supporting device for a wire outlet device of an ultra-high-voltage converter transformer. The transportation supporting device for the wire outlet device of the ultra-high-voltage converter transformer comprises a first supporting plate, a second supporting plate, a fixed plate and a protective paper barrel, wherein grooves are separately formed in the midpoint of the bottom side of the first supporting plate and the midpoint of the top side of the second supporting plate in the height directions of the supporting plates; the two supporting plates are intersected together in a crossed manner through the two grooves and are mounted on a transportation base through a fixing late; one end of the protective paper barrel extends into a paper barrel of the wire outlet device while the other end of the protective paper barrel sleeves the top side of the first supporting plate and the top side of the second supporting plate; and the top side of the first supporting plate and the top side of the second supporting plate are inserted in the paper barrel of the wire outlet device. The invention provides the novel transportation supporting device; by the novel transportation supporting device, the wire outlet device can be conveyed horizontally or vertically along with a transformer body; the device is convenient to operate; requirements on the safety and reliability of the wire outlet device in a complicated transportation environment can be met; and the transportation cost is reduced while the paper barrel of the wire outlet device is prevented from being damaged.