The utility model discloses a transformer on -load voltage regulating switch examines and repair instrument, this maintenance instrument include base (1), horizontal davit (5), chain block (6), bracing piece (7) and examine and repair tray (8) that two spinal branch vaulting pole (7) are installed on base (1) through the bolt symmetry, be provided with fixed orifices (4) on bracing piece (7), horizontal davit (5) through fixed orifices (4) and bolted connection on bracing piece (7), intermediate junction chain block (6) of horizontal davit (5), bolted connection support piece (9) are passed through to the bottom of bracing piece (7), and the shape is fixed on support piece (9) through fastening bolt (10) like maintenance tray (8) of " concave " type. The utility model discloses simple structure, firm in connection, low cost, convenient to use shortens repair time, reduces the manpower, avoids the diffusion of transformer oil mark, promotes maintenance work safety.