The utility model discloses an insulating cover for a top switch blade of a 10 kV pole. The insulating cover comprises an insulating cover body. The insulating cover body is an insulating cylinder, the cross section of the cylinder is rectangular or square, an opening which the switch blade can pass through is formed in one side surface of the cylinder in the length direction, the inner side of the opening is covered with a soft silica gel piece, and the soft silica gel piece is only connected with one side edge of the opening. The insulating cover body comprises a first insulating layer, an air layer and a second insulating layer from outside to inside, and first ventilation holes and second ventilation holes are distributed in the first insulating layer and the second insulating layer respectively and are formed in a staggered mode. The insulating cover is quite convenient to install and has the technical effects of ventilation, heat dissipation and damp proofing; the frequency of short circuit tripping, caused by birds or small animals, of a distribution network line can be reduced, the reliability of power supply is improved, the continuous power supply is achieved for users, economic benefits are increased, the maintenance workload of power supply enterprises is reduced, and the personnel cost is lowered.