The invention provides a mobile deicing device for a transformer substation. The device includes a horizontal frame, the bottom of the horizontal frame is provided with walking wheels, the rear side of the horizontal frame is fixedly connected with a vertical frame, the top of the vertical frame is fixedly connected with a handrail frame inclined backward, the front side of the vertical frame is provided with an U-shaped clamp sleeve with an opening facing forward, the inside of the U-shaped clamp sleeve is provided with a hand-held deicing tool in a clamping connection mode, and the horizontal frame is provided with a hot-air de-icing device and a storage battery. According to the device, hot air is adopted for melting ice firstly, the safe tool is then used for removing ice blocks obtained after ice melting, operation is safe and reliable, the de-icing process saves time and labor, the adopted de-icing tool has multiple functions, the de-icing effect is greatly improved, a structure in which a tool head is convenient to replace is designed, operation is rapid and convenient, and the reliability is high.