The utility model discloses a heating device for be used for 750 kilovolts of GIS air chamber excessive water content to handle, the equipment that it can be convenient realizes the heating to the GIS air chamber at GIS air chamber surface. The utility model provides a technical scheme that its technical problem adopted is: heating device for be used for 750 kilovolts of GIS air chamber excessive water content to handle for heating GIS air chamber, the utility model discloses it installs the annular heating element at GIS air chamber surface to contain the equipartition, distance between the adjacent annular heating element is H, and H >= 5mm, be provided with the GIS flange on the GIS air chamber, distance between annular heating element and the GIS flange is D, and D >= 100mm, the annular is among the heating element, along keeping away from GIS air chamber direction in proper order for heating plate, heat insulating board, heated board and the safety cover of circular telegram post heating, the area of heating plate is less than the area of heat insulating board.