Insulating cover capable of increasing creepage distance

The utility model discloses an insulating cover capable of increasing a creepage distance. The insulating cover comprises closed type cover bodies and an opening slit is vertically arranged at the right center of the bottom part of each cover body; the cover bodies at two sides of the openings slits respectively downwards extend to form left and right joint components; and the insulating cover further comprises positioning dovetail groove structures which are arranged on the left and right joint components and are used for fixedly jointing the left and right joint components. In the utility model, the creepage distance is increased and the withstand voltage level is improved by arranging the positioning dovetail groove structures. Meanwhile, the insulating cover is convenient to dismount and mount so that live-wire work can be conveniently carried out by workers and the external force damaging accident can be effectively avoided.