A heating device includes: a liquid storage chamber configured for storing tobacco liquid; the liquid storage chamber comprising a liquid conducting hole; a heating component comprising at least one heating element and a receiving cavity; the at least one heating element being received in the receiving cavity; and between the heating element and the receiving cavity or between the adjacent heating elements including a liquid storage sump; the heating component being connected with the liquid storage chamber; and the heating element being disposed under the liquid conducting chamber and corresponding with the liquid conductive hole; the tobacco liquid in the liquid storage chamber flowing towards the heating element, through the liquid conductive hole, the heating element heating the tobacco liquid for atomization; the liquid storage sump configured for storing some of tobacco liquid leaking from the heating element, the heating element atomizes the tobacco liquid in the liquid storage sump.