The invention relates to a short-circuit fixture for replacing a 220 kV tubular bus stretchable cable clamp in an electrified manner. The short-circuit fixture comprises a tubular bus clamp, a fixed bracket, a drainage wire pressure plate, a hinged frame, a support rod, a sliding jacket, an insulated handle and a double-ended diversion line; the tubular bus clamp and the fixed bracket are hinged; the drainage wire pressure plate is fixed at two sides of the tubular bus clamp through a bolt, and connected to the double-ended diversion line; the fixed bracket and the support rod are fixedly connected; the sliding jacket sleeves the support rod; the sliding jacket is hinged with the tubular bus clamp through the hinged frame fixed at the front end of the sliding jacket; a pressure spring is arranged on the support rod between the fixed bracket and the sliding jacket; and the insulated handle is arranged at the tail end of the support rod. The fixture disclosed by the invention is small in volume, light in weight and convenient to transport and store, and can be adaptive to an operating environment of a 220kV tubular bus of a transformer substation; therefore, electrified replacement of a heat emitting stretchable cable clamp becomes reality; the problem that no tool is used for electrified disassembly of the tubular bus and installation of the heat emitting stretchable cable clamp can be solved; and the short-circuit fixture is safe, convenient and rapid to operate.