The invention discloses a quick replacement device for office building energy-saving lamps. The quick replacement device comprises a first extension rod, a second extension rod, a lengthening rod, a connecting piece, a supporting plate and shrinkage rods. The second extension rod and the first extension rod are connected through a fastening threaded sleeve, the connecting piece and the second extension rod are fixed through a second fastening bolt, the lengthening rod is fixed to the first extension rod through a first fastening bolt, a connecting plate is arranged on the supporting plate on the connecting piece, multiple rotating wheels with the shrinkage rods are arranged at the edge of the connecting plate, the tail ends of the shrinkage rods are connected with clamping posts with sponge mats, and connecting rings at the middle portions of the shrinkage rods are connected to a shrinkage bolt on the connecting piece through shrinkage lines. The quick replacement device is simple in structure, ingenious and reasonable in design, capable of quickly replacing the energy-saving lamps of different shapes and different diameters, high in safety, suitable for installation of the energy-saving lamps at different heights, and capable of lowering the difficulty of replacement operation and eliminating the danger of replacement operation.