The utility model relates to an overline hanging basket. The structure of the overline hanging basket is as follows: a safe closely-knitted net, an insulation broad and an insulation closed board which is made of a special material are connected with a main beam of the hanging basket through a rear cross beam of the hanging basket and a front cross beam of the hanging basket in a hanging way; the rear end of the main beam of the hanging basket is connected with a casted beam body through a rear hanging basket anchor; the lower end of the main beam of the hanging basket is supported through a rear landing leg and a front landing leg; and the rear cross beam of the hanging basket, the front cross beam of the hanging basket, the rear hanging basket anchor, the rear hanging basket landing leg and the front hanging basket landing leg constitute a whole. The closed insulation protection method of the handing basket comprises the steps of: closing and insulating a hanging basket system, storing water and designing an alarm system. The overline hanging basket has the advantages that protection constructions, such as the building and dismantling of an overline protecting shed frame, are not needed, thereby avoiding the damage to the existing line pavement, terrace and the like, improving the compaction degree, waterproof property, electric induction concentration resistance, dropping resistance and the like of the insulation system and avoiding potential safety hazards brought by the fact that a high-value high-voltage-resisting insulation board is easy to drop and damage. The utility model belongs to the hanging basket protection technology with the closure, insulativity, rigidity and strength meeting the safety requirements.