Ton bag heat sealing system and ton bag heat sealing method

The ton bag heat sealing system comprises a loading travelling crane, an upper-layer conveying frame, a lower-layer conveying set, a heat sealing machine and a clamping conveying assembly, the loading travelling crane is used for hoisting ton bags, and the loading travelling crane is provided with a bag opening mechanism for opening bag openings of the ton bags in a linear mode; the upper-layer conveying frame is used for placing the loading crane, so that the loading crane reciprocates between a hoisting position and a loading position in the horizontal direction; the lower-layer conveying set is located below the upper-layer conveying frame and used for driving a tray to move in a reciprocating mode, and the tray can bear ton bags at the loading position. The heat sealing machine is located at the tail end of the lower layer conveying set and used for heat sealing of the ton bags. The clamping and conveying assembly is used for clamping the ton bags in the linear direction and transferring the ton bags to t