Dynamic distributing expanding device of tyre builder

The utility model relates to a power fabric spreader of a tire forming machine, wherein the front end, the rear end and the middle portion of a spindle are sleeved with sliding bases and fixing bases. A linear driver at the rear end of the spindle is connected with the sliding base at the rear end and 2-4 push rods are connected with each sliding base for guaranteeing synchronization. A motor at the rear end of the spindle is in driving connection with a power roll via a driving mechanism and a universal coupler, and two ends of the power roll are hinged with the sliding bases and the fixing bases of the front end, the middle portion and the rear end of the spindle via a connecting rod respectively and form an angle ranging from 5 degrees to 10 degrees with the spindle. Two ends and the middle of 3-20 sets of driven rolls are hinged with corresponding sliding bases and fixing bases via connecting rod mechanisms, and the driven rolls and a power roll are arranged around the spindle to support rubber materials.