The invention relates to a power transformer with an air exhaust cooling channel and belongs to the technical field of novel electric equipment manufacture. The power transformer with an air exhaust cooling channel comprises a transformer case, a case bottom, a coil iron core, a vertical heat dissipating tube, an elbow, a horizontal heat dissipating tube, an air exhaust pipe, a lower bearing pedestal, a fan blade shaft, fan blades, an upper bearing pedestal, wind blades and a thermal superconducting tube. During application, the power transformer with the air exhaust cooling channel is mountedoutdoors, the wind blades drive the coaxial fan blades to rotate to suck out air inside the air exhaust pipe; the thermal superconducting tube continually conducts heat into the vertical heat dissipating tube, and the heat is continually exhausted by the out-sucked air, so that even in days without wind, due to the principle that hot air is light in specific weight and can move up naturally, airinside the vertical heat dissipating tube can also move up naturally and be exhausted into the atmosphere through the air exhaust pipe at the top end, meanwhile, the opening at the lower end of the vertical heat dissipating tube sucks air in to form a thermosiphon natural circulating state. Therefore, the power transformer with the air exhaust cooling channel has the advantages of being convenientto use, reliable in operation, energy-efficient, environmentally friendly and the like.