The utility model provides a heat -sealing device. The problem of current heat -sealing device's upper and lower hot -rolling axle relative pitch can not adjust is solved. It includes the heat -seal frame, heat -seal frame on be equipped with the heat -seal groove, the heat -seal inslot be equipped with first heat -seal roller and second heat -seal roller, first heat -seal roller locate on the first heat -seal piece, first heat -seal piece and heat -seal frame about the cooperation of sliding, heat -seal groove upper cover put the pressure adjustment board, the pressure adjustment board on be equipped with handle, balance staff and regulation pole, the regulation pole pass the pressure adjustment board and be connected with first heat -seal piece, the handle be connected with the balance staff, the balance staff slide about the heat -seal frame through adjusting the first heat -seal piece of pole drive. The utility model discloses a handle, balance staff, regulation pole drive reliable the sliding of first heat -seal piece about the heat -seal frame, adjust the distance between first heat -seal roller and the second heat -seal roller, and the heat sealing packaging of the material of being convenient for can also carry out certain traction effect to the material.