The invention relates to the technical field of a power accessory mechanical structure, in particular to an insulator. The insulator comprises an upper body and a lower body, wherein a plurality of insulation pieces are arranged between the upper body and the lower body, a first penetrating post is arranged at the upper body, a second penetrating post is arranged at the lower body, the first penetrating post sleeves the second penetrating post, first hollow pipes are arranged at two sides of the upper body, second hollow pipes are arranged at two sides of the lower body, a plurality of first penetrating holes are symmetrically formed in the first hollow pipes, a plurality of second penetrating holes are symmetrically formed in the second hollow pipes, positioning assemblies are arranged onthe second hollow pipes and are used for positioning the first hollow pipes and the second hollow pipes, and line buckle mechanisms are arranged at two sides of the lower body and are used for buckling lines. The insulator is simple in structure and reasonable in design the distance between the upper body and the lower body can be adjusted, the insulator is applicable to various working conditions and environments, is convenient to use and is high in universality, and the situation that the insulator falls off from a cable to cause an accident is also prevented.