The invention discloses a cementing type bell-shaped disk-shaped suspension type
polymer string insulator unit. The
polymer string insulator unit comprises a steel cap
metal element and a steel foot
metal element, wherein a cavity with a U-shaped section is formed in the steel cap
metal element, the steel foot metal element is provided with a cone head portion matched with the cavity, the cone head portion of the steel foot metal element is arranged in the cavity of the steel cap metal element, a
polymer insulating element is arranged between the cone head portion and the cavity, the polymer insulating element comprises a bell-shaped skirt, the center of the skirt is provided with a cementing portion which is a cavity of an inverted cone shape, the inner wall of a bell-shaped body is provided with a plurality of prismatic protrusions coaxial with the polymer insulating element, the cone head portion of the steel foot metal element is integrated with the cementing portion through an
adhesive in a cementing mode, and the cavity of the steel cap metal element is integrated with the cementing portion through an
adhesive in a cementing mode. The polymer string insulator unit has the advantages of preventing bird damages, and being resistant to wind and sand, resistant to damages caused by external force and capable of assisting climbing.