The invention relates to a voltage transformer and a lead wire structure thereof. The voltage transformer comprises a transformer body and the lead wire structure, wherein the lead wire structure comprises a pot type insulator and a screening tube, a lead-out wire, of which the lower end is connected with the transformer body, is arranged in the screening tube in a threading manner, a switching electric conduction seat is arranged on a central conductor of the pot type insulator, the upper end of the lead-out wire is fixed on the switching electric conduction seat through a wire connecting structure, and the upper end of the screening tube is fixed on the switching electric conduction seat through a screening tube connecting structure. According to the invention, the problem that the lead-out wire is easy to influence by the screening tube to come off because the screening tube and the lead-out wire share the same connecting structure in the conventional lead wire structure is solved.