The invention discloses a dry mica tape comprising a mica paper layer, a mylar cover, a first adhesive layer adhered between one face of the mica paper layer and the mylar cover, and a second adhesive layer adhered on the other face of the mica paper layer. The adhesive used by the first adhesive layer and the second adhesive layer is prepared by mixing the following components in part by weight:20 to 40 parts of hyperbranched polyester resin with number average molecular weight of 20,000 to 50,000; 60 to 90 parts of epoxy resin; 50 to 120 parts of organic solvent and 0.1 to 1 part of accelerating agent, wherein the accelerating agent may be organic carboxylic acid metal salt, acetylacetone metal salt or the mixture of the organic carboxylic acid metal salt and the acetylacetone metal salt. The dry mica tape uses the adhesive formed by combining hyperbranched polyester resin with high average molecular and epoxy resin, thus the adhesion strength of the adhesive can be greatly enhanced to increase mica quantification, markedly reduce dielectric loss and improve breakdown potential. Therefore, the dry mica tape is suitable to be used in the insulation structure of a high-voltage motor.