The invention relates to a pole-mounted switch insulating cover of a power distribution line. The pole-mounted switch insulating cover mainly comprises an insulating cover body, insulating sleeves and connecting hot-dipping band iron, wherein three insulating sleeves are arranged in the insulating cover body; galvanized bolts pass through the insulating sleeves and are fixed on the insulating cover body; two pieces of connecting hot-dipping band iron are fixed at the bottom of the insulating cover body through the bolts; three pairs of uniformly arranged arresters are fixed on a pole-mounted switch body through an arrester bracket; one pair of arresters in the middle is connected and fixed with the connecting hot-dipping band iron; adjusting bolt holes are formed in arrester bracket junctions on the connecting hot-dipping band iron, and correspond to the bolt holes on the arrester bracket; and an insulating support sleeve and a switching column head are arranged at the corresponding position of each arrester. The pole-mounted switch insulating cover has the beneficial effects of being reasonable in structure, convenient to use and good in fixing effect; a line fault caused by bird nests on the pole-mounted switch of the power distribution line can be effectively prevented; and line tripping is avoided.