The invention relates to the field of transformers, and specifically discloses a lightning-proof transformer. The lightning-proof transformer comprises a support mechanism, a heat sink, a transformershell, a lightning protection mechanism, a denoising mechanism, a control mechanism, a driving mechanism and a cooling mechanism; the lightning protection mechanism cooperates with the denoising mechanism, in a rainy day, a cross bar conveys rainwater into the inside of a water tank, thus, water source is saved, noise in the transformer is reduced, residents are helped to take a rest; the controlmechanism cooperates with a push mechanism, when the internal temperature of the transformer shell rises up, internal hydrargyrum of a hydrargyrum tube expands and goes up to jack up a piston, and thus, a second baffle drives a first baffle located at a supporting side wall to move upwards, a first sheet metal of the side wall of a pointer is electrically connected with a second sheet metal, opening of a solenoid valve, pumping oil from the heat sink by an oil pump and performing heat dissipation for insulating oil by a fan are realized, service life of the transformer is increased; and a spring is mounted between the driving mechanism and the control mechanism, that the first baffle and the second baffle reset immediately when the inside of the transformer shell declines is avoided, and acooling effect is improved.