The invention relates to the technical field of glassware mechanical equipment, in particular to a high borosilicate glass pot mouth moulding device. The device includes a base, and an indexing turntable mechanism and a pot mouth modeling mechanism. Several sets of clamping mechanisms uniformly arranged along the circumference are installed on the indexing turntable mechanism. The pot mouth modeling mechanism includes a modeling wheel and a driving mechanism thereof, the driving mechanism has an air cylinder A arranged along the radial direction of the indexing turntable mechanism, a sliding groove in longitudinal arrangement is fixed at the telescopic end of the air cylinder A, and a sliding block is assembled in the sliding groove. A stand column for installing the modeling wheel is fastened on the sliding block, the left side and/or right side of the sliding block is equipped with a guide wheel, which cooperates with a guide groove on a fixedly installed guide seat, and the guide groove consists of a front arc-shaped groove section and a rear linear groove section. The high borosilicate glass pot mouth moulding device provided by the invention has the characteristics of simple structure and ingenious design, realizes the mass production of high borosilicate glass pots, and ensures the moulding quality of high borosilicate glass pot mouths.