A denoising method of a 10kV rod transformer belongs to the field of environmental friendliness. A sound isolation device is arranged on a noise propagation path from the rod transformer to a residential building, the influence of rod transformer noise on an environment is reduced from the propagation path, the propagation of running noise of the rod transformer is reduced/prevented by arranging the sound isolation at a position near to a side surface of the rod transformer, and the sound isolation device can be arranged outside a certain side surface of the rod transformer and also can be arranged outside a plurality of side surfaces of the rod transformer. By arranging the sound isolation device, denoising quantity of 10dB (A) or above can be obtained, and the denoising method is simpleto implement; and by blocking/absorption/elimination of the running noise of the rod transformer, the problem of noise disturbance of the rod transformer on a surrounding residential environment is solved, the denoising effect of a sound absorption and isolation device is relatively remarkable, the safety running requirement can be met, the rod transformer is convenient to install, low-cost implementation is facilitated, and the denoising method can be widely applied to the field of running management and noise elimination and control of the rod transformer.