The utility model relates to the technical field of bottle blowing machines, in particular to a circulating blank feeding device of a bottle blowing machine, which is characterized in that a motor drives a driving wheel to rotate, and the driving wheel drives a driven wheel to rotate through a transmission chain; the transmission chain is fixedly connected with a plurality of bottle preform clamping seats, the bottle preform clamping seats move along with the transmission chain, and bottle preforms sliding out of the bottle preform slideway fall into clamping seat openings of the bottle preform clamping seats and then are conveyed along the fixed pressing plate and the movable pressing plate; the air cylinder can drive the movable pressing plate to be separated from the bottle preform clamping base, so that the mechanical clamping jaw clamps bottle preforms on the bottle preform clamping base within the length range of the movable pressing plate, and the subsequent bottle preform forming step is carried out. Due to the fact that the transmission chains are connected end to end, bottle blanks can be conveyed circularly and continuously, and the conveying and clamping efficiency of the bottle blanks is greatly improved. A clamping base guide rail used for bearing the bottle blank clamping base is arranged below the bottle blank clamping base, the bottle blank clamping base can horizontally move on the clamping base guide rail, deviation of the bottle blank clamping base in the moving process is prevented, and the positions, clamped on all bottle blanks, of the mechanical clamping jaws are unified.