The embodiment of the invention provides an organic protective sleeve for an insulator metal-ware corrosion extremely serious region. The inner ring surface, making contact with an umbrella-shaped thickening type zinc sleeve (42), of the organic protective surface (41) is inclined, the inclined angle of the inner ring surface is the same as an umbrella cover angle of the umbrella-shaped thickening type zinc sleeve (42), and an insulator comprises an iron cap (61), a locking pin, an insulating part, a steel foot (11), a zinc protective sleeve (13) and the organic protective sleeve (41), so that a corrosion portion of the zinc protective sleeve (13) is changed, the corrosion portion is transferred from a junction, bearing mechanical stress, of the steel foot (11) and cement (12) to an exposed portion, not bearing the mechanical stress, of the zinc protective sleeve (13), the degradation of bonding characters between adhesives of the zinc sleeve and the cement (12) is avoided, and the mechanical strength of the insulator is guaranteed.