The invention discloses an on-column transformer mounting-to-position device. The on-column transformer mounting-to-position device comprises an electric heater, a frame fixer, an automatic temperature regulator, a distance regulator, an internal circulation water cooling radiator, a separator plate and a true color operation screen, wherein an outer casing of the electric heater is equipped with a first soaking drier, and an upper portion of the frame fixer is provided with a box cover. The on-column transformer mounting-to-position device is advantaged in that fund saving is realized, 200-yuan crane cost for crane operation required in the prior art can be further saved as the on-column transformer mounting-to-position device needs no crane operation, mounting-to-position operation can be carried out in a narrow space which is not enough for the crane to come in, the on-column transformer mounting-to-position device can operate in the narrow space, the on-column transformer mounting-to-position device is light and practical, can be dismounted and assembled and can be carried, moved, assembled and dismounted only through three persons, manpower is saved, on-column transformer assembling can be carried out only by 3-5 persons through the device, reduction of present construction workers is effectively facilitated, energy saving and environmental protection are realized, and no kinetic energy machinery is utilized.