Provided is a single hook for an insulating horizontal ladder. The single hook for the insulating horizontal ladder is composed of a hook component (1), a hanging ring component (2), a triangular connecting component (3) and a threaded rod component (4). When the single hook for the insulating horizontal ladder is used, one end of an insulating horizontal ladder body (5) is arranged on a wire, two legs at the other end of the insulating horizontal ladder body (5) are fixed on the triangular connecting component (3) of the single hook for the insulating horizontal ladder through the threaded rod component (4), a pin pull ring (10) is pulled, a hook body (7) is hung on angle iron of an iron tower, and then a lock pin is released. The single hook for the insulating horizontal ladder is safe, reliable, convenient to use, easy to machine, and low in cost.