The invention discloses a device for improving the on-site X-ray shooting efficiency of a gas insulated switch. The device comprises a nylon tape, a main bracket, multiple bridging supports, sliding guide rails, an imaging plate fixing frame sleeve and a fastener; when the device is used, the nylon tape sequentially penetrates through the bridging supports and the main bracket and then is arranged on the surface of a busbar barrel in a sleeving mode after the two ends of the nylon tape are connected through a hook; the bridging supports and the main bracket roll on the surface of the busbar barrel, and then the position of the imaging plate fixing frame sleeve arranged on the main bracket is determined; meanwhile, the imaging plate fixing frame sleeve also can transversely move on the sliding guide rails, and therefore all-dimensional inspection on the busbar barrel is achieved. Accordingly, after the detection device is arranged for the first time, the imaging plate fixing frame sleeve can move to any positions of the surface of the busbar barrel to achieve comprehensive radiographic testing on the barrel, device disassembling and erecting for the second time is not needed, and therefore the testing comprehensiveness and the time economical property are improved.