The invention relates to the technical field of an electric reactor, and particularly relates to an electric reactor insulating structure not wrapped with glass fiber reinforced plastics. The electric reactor insulating structure comprises an electromagnetic wire; and the outer surface of the main insulation part is wound with an alkali-free wax-free polyester yarn mixed woven band which is formed by taking polyester yarn as weft and glass fiber yarn and polyester yarn as wrap through tabby weaving. The electric reactor insulating structure is high in insulation intensity, and the electric reactor coil is simple in structure, light in weight, short in winding time and low in cost; the electric reactor is high in heat dissipation capability and long in insulation service life so that turn-to-turn insulativity is improved; and the exterior of the main insulation part of the wire is wound with the alkali-free wax-free polyester yarn mixed woven band, and epoxy resin impregnation is also performed in the coil winding process of the wire, so that the turn-to-turn insulation thickness and turn-to-turn voltage withstand can be improved.