Abstract: A standing structure for a shell of an extension cord is provided. Intercalating trenches are disposed on rear edges of a pair of opposite surfaces of the shell of the extension cord. A support frame includes a horizontally-disposed bottom plate and a vertically-disposed support plate connecting the bottom plate and having two intercalating strips intercalated into the intercalating trenches. Thus, the shell of the extension cord can be combined with the support frame to form the standing structure. The planar surface, not combined with the shell of the extension cord, of the support plate thus can face to a user for hiding power outlets and power cables plugged into the power outlets.