The invention provides an oil-transformer transformer heat dissipation device, belonging to the technical field of power transformation engineering. The oil-transformer transformer heat dissipation device in the technical scheme comprises a substation and a cooling mechanism communicated with the substation, wherein the cooling mechanism comprises an air box; one upper side of the air box is provided with an air inlet passage communicated with the air box; a coil is also arranged in the inner middle position of the air box and located below the air inlet passage; the oil-transformer transformer heat dissipation device also comprises a water tank disposed underground; the water inlet of the coil is connected to a water pump; the water pump is connected to the water tank through a water pipe; the water outlet of the coil is communicated with the water tank; the lower middle position of the air box is communicated with the lower middle position of the substation through an axial fan; andthe top of the substation is provided with an air exhaust port. The oil-transformer transformer heat dissipation device has the beneficial effects that air entering the substation can be cooled and then passes into the substation to dissipate heat in the substation and the oil-immersed transformer.