The invention relates to an electronic type gray code driving device for an iron roller door. The electronic type gray code driving device comprises a main body base, a transmission machine set and a torque detection unit, wherein the main body base is provided with an inner space allowing the transmission machine set and the torque detection unit to be arranged, and is provided with a rotating cover linked with the transmission machine set; the transmission machine set comprises an electric motor for providing a power source; a digital module for controlling the operating mode of the electric motor is arranged on the main body base; the torque detection unit can synchronously generate gray codes when the transmission machine set operates and can transmit the generated gray codes to the digital module, so that the preset application of accurate positioning of the iron roller door is achieved.