The coil of dry-type transformer with high quality NOMEX insulation from a non sealed dry-type transformer materials. The NOMEX coil winding insulation materials, by VPI vacuum impregnation solventless varnish, and high temperature curing. Cold-rolled silicon steel sheet with high quality high permeability. The product has the advantages of energy saving, small volume, light weight, partial discharge, subjected to thermal shock resistance, large load capacity, flame retardant, high fireproof performance, automatic control etc.. Can be widely used in power transmission system, airport, subway, power plant, metallurgy, hospitals, stadiums, high-rise buildings, hotels, shopping centers, densely populated areas, petrochemical, nuclear power, nuclear submarines and other places.