A four-link strain insulator string of a +/- 800KV heavy icing area belongs to hardware strings for erecting power transmission lines and is used in two pieces of hanging point hardware connected with a tower. Each piece of hanging point hardware is connected to the left end of a first link plate by the aid of a bolt after being connected with the same hardware, and the right end of the first link plate is connected with two insulators by the aid of bulb hanging rings. Two of four insulators are connected onto a second link plate, the other two insulators are connected onto another second link plate, and the two second link plates are respectively connected with a combined link plate by the aid of right-angle hanging plates. The two insulators are provided with an open or double-leg split equalizing ring, and the combined link plate consists of a two-to-four link plate, the two right-angle hanging plates and two one-to-two link plates in a connected manner by the aid of bolts. Besides, two shield rings are fixed to the upper end and the lower end of the two-to-four link plate by the aid of a support. The four-link strain insulator string has the advantages of convenience in installation of the equalizing ring, stable structure and high strength.