The invention relates to a method for reconstructing visible light and infrared images for electric equipment online detection, wherein the method comprises the following steps: making an analysis of the effective characteristics of an infrared image and a visible light image; performing contour-information-based image registration; through the use of the image registration resultand according to the effective characteristics analyzing result, extracting the effective characteristics from the infrared image and the visible light image after image registration; performing image overlapping; and completing the reconstruction of the visible light image and the infrared image. Compared with the prior art, the method of the invention can reflect the defective characteristics of electric equipment in a very direct way so as to benefit the comprehensive judgment of the defects of the electric equipment. In addition, the algorithm is stable; the information reservation degree is high and the method can be applied more widely.