An SF6 gas cylinder transport cart comprises a first fixing frame and a connection frame. The upper end of the first fixing frame and the upper end of the connection frame are connected with arc handrails. The connection frame is arranged obliquely. The two sides of the connection frame are each provided with a plurality of arc supporting plates and tightening belts. A base board is arranged at the lower end of the connection frame. The first fixing frame is composed of two vertical frames and a plurality of connection rods, wherein the cross section of each vertical frame is in a C shape. The connection rod is connected with the two vertical frames. A first supporting leg capable of moving vertically along the vertical frames is arranged in the two vertical frames. An oblique second fixing frame is connected to the lower end of a second fixing rod. The oblique direction of the second fixing frame is coincident with that of the connection frame. A second supporting leg capable of moving vertically along the second fixing frame is arranged in the second fixing frame. The SF6 gas cylinder transport cart moves on the flat ground through idler wheels on the two supporting legs; by arranging the telescopic first supporting leg in the first fixing frame and the telescopic second supporting leg in the second fixing frame, the two supporting legs can be controlled to be telescopic by a winch mechanism when the SF6 gas cylinder transport cart goes upstairs or downstairs, the gas cylinder fixing angle is changed, and transportation is facilitated.