The invention relates to a disconnecting switch rotating shaft welding and connecting lever assembling tool. The disconnecting switch rotating shaft welding and connecting lever assembling tool comprises a base, a rotating shaft positioning structure enabling a rotating shaft to be rotationally arranged during rotating shaft welding and achieving positioning in the radial and axial direction is arranged on the base, the tool is further provided with a connecting lever positioning block for positioning a connecting lever, and a connecting lever positioning pin for being positioned and insertedinto a pin hole in the connecting lever is arranged on the connecting lever positioning block; the base is further provided with a dial and indication marks, wherein the dial is rotationally assembledand used for being arranged coaxial with a flange plate welded to the rotating shaft, and the indication marks are used for indicating scales of the dial, and the dial is provided with a flange platepositioning pin for being positioned and inserted into a connecting hole in the flange plate. By adopting the technical scheme, conversion between the peripheral position of the flange plate and theperipheral position of the dial can be achieved, then, quantified adjustment of the flange plate can be achieved by peripheral quantified adjustment of the flange plate, the tool is suitable for anglechanges of connecting lever and rotating shaft welding, and the assembling requirement for various product structures is met.