The utility model relates to a bulb replacing tool, including the bulb cup that can hold the bulb, the one end setting is in bulb bottom of cup portion, the other end is provided with the connecting axle of handle, the cover is established connecting axle outlying fixing sleeve, the connecting axle can the fixing sleeve internal rotation, the bulb cup can be followed the handle rotates together. Among the prior art, adopt lamps and lanterns overall change's mode to maintain to the damage bulb that has in radioactive hot laboratory cave more, increased radioactive waste's production. Adopt bulb replacing tool, can directly change the bulb, reduced radioactive waste's production, accord with the wastes material minimizing principle of examining engineering requirement more.