The invention provides a gas steel cylinder heating device. The gas steel cylinder heating device solves the technical problem of slow gas charging speed of existing sulfur hexafluoride gas steel cylinders. The heating device is characterized by comprising a base plate. The undersurface of the base plate is equipped with universal wheels with brakes. An electric heating water tank with an upward opening is arranged on the base plate. A heating device is arranged at the bottom of the electric heating water tank. A plurality of longitudinal stand columns are arranged on the base plate and at the periphery of the electric heating water tank. A driving frame is arranged at the upper parts of the stand columns. Guide rails are arranged at two sides of the driving frame. A crossbeam is arranged on the guide rails and can move along the guide rails. A driving motor and a lifting rope driven by the driving motor are arranged on the crossbeam. A pulley with a lifting hook is arranged on the lifting rope. The gas steel cylinder heating device meets the requirements of electric power construction safety working regulations, has high safety, achieves automatic temperature control, is convenient to operate, increases the gas charging speed of sulfur hexafluoride gas when a GIS device is installed, and raises the utilization rate of sulfur hexafluoride gas.