A siphon tapping device for blast furnace iron-making comprises a blast furnace(1) and a molten iron conveying passage(3) set along the direction of tap-hole(6) of the blast furnace. The tap-hole (6) of the blast furnace connects with a forehearth (4) through the molten iron conveying passage (3). A forehearth tap-hole (7) is set at the upper lateral side of the forehearth (4). Tapping machines (2, 5) are set at the tap-hole (6) of the blast furnace and the tap-hole (7) of the forethearth respectively.
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