The utility model discloses a cover is shielded in insulation of being applied to electrified overlap joint cable draw -out lines of 10kV, including the insulating boot body and insulating substrate, the insulating boot body includes preceding curb plate, left side board, right side board, roof and insulating boss, consecutive lower extreme opening and the rear end open -ended box structure of enclosing into of preceding curb plate, left side board, right side board and roof, and the rear end at the roof is fixed to insulating boss, insulating substrate sets up perpendicularly, and insulating substrate is last to set up an insulating boss interface, and insulating boss is pegged graft in this insulating boss interface, and the rear end opening of the insulating boot body bonds on insulating substrate's front surface, insulating substrate is last to have seted up two handrail holes, a recess is upwards offered respectively to the bottom of insulating substrate's the bottom and the preceding curb plate of the insulating boot body, and two groove phases are to setting up. The utility model discloses a cover is shielded in insulation of being applied to electrified overlap joint cable draw -out lines of 10kV has good insulating nature, the installation simple operation, and light in weight, easy transport, the reliability is high, high -efficient safety.