Heat sealing machine for packaging bag

The utility model provides a packaging bag heat sealing machine which comprises a bottom plate, a first rotating column is arranged on the rear side of the top of the bottom plate, a first synchronous belt wheel is arranged on the top of the first rotating column, a second rotating column is arranged on the side, away from the first rotating column, of the top of the bottom plate, and a second synchronous belt wheel is arranged on the top of the second rotating column. A first transmission belt is arranged between the first synchronous belt wheel and the second synchronous belt wheel, a first L-shaped plate is further arranged at the top of the bottom plate, a first rotating motor connected with the second synchronous belt wheel is arranged at the bottom of the first L-shaped plate, and a moving structure is arranged at the top of the first synchronous belt wheel. According to the heat sealing machine for the packaging bag, heat sealing can be conducted on the packaging bag, the angle and the direction can be