A vaporizer, comprising: a first outer casing; a second outer casing; a main body disposed between the first outer casing and the second outer casing, the main body comprising a side wall; a first heating unit; a second heating unit; a first connector; a second connector; a fastener; a fixed part; a pneumatic switch; a button; a support frame; a control plate; a light column; a battery; wherein: the main body comprises a groove; the button is disposed on the support frame, and the support frame is embedded in the groove; the control plate is disposed on the main body; the light column is fixed on the control plate; and the battery is disposed at one side of the main body and between the first outer casing and the second outer casing; characterised in that: the vaporizer further comprises a buckle, a fixing pin, a first spring, a second spring, and a turnover member disposed at one side of the main body and being next to the side wall of the main body; the side wall comprises a first semi-circular hole; the turnover member comprises a second semi-circular hole; the first semi-circular hole and the second semi-circular hole abut each other and form a through hole; the first heating unit is cup-shaped and is disposed under the through hole; the first heating unit abuts against the turnover member; the second heating unit is disposed below the first heating unit and on the first connector; the first connector is sheathed on the second connector and fixed by the fastener; the pneumatic switch is disposed in the fixed part; the fixed part is disposed in the fastener; the second connector is disposed at an inner side of the turnover member; the first spring is disposed on the turnover member; the turnover member is fixed on the main body via the fixing pin; the buckle is disposed on the side wall; the second spring is disposed on the buckle; and the turnover member is curved and fixed on the main body via the buckle and is capable of overturning outwards with respect to the main body by extension of the first spring. a first outer casing; a second outer casing; a main body disposed between the first outer casing and the second outer casing, the main body comprising a side wall; a first heating unit; a second heating unit; a first connector; a second connector; a fastener; a fixed part; a pneumatic switch; a button; a support frame; a control plate; a light column; a battery; the main body comprises a groove; the button is disposed on the support frame, and the support frame is embedded in the groove; the control plate is disposed on the main body; the light column is fixed on the control plate; and the battery is disposed at one side of the main body and between the first outer casing and the second outer casing; the vaporizer further comprises a buckle, a fixing pin, a first spring, a second spring, and a turnover member disposed at one side of the main body and being next to the side wall of the main body; the side wall comprises a first semi-circular hole; the turnover member comprises a second semi-circular hole; the first semi-circular hole and the second semi-circular hole abut each other and form a through hole; the first heating unit is cup-shaped and is disposed under the through hole; the first heating unit abuts against the turnover member; the second heating unit is disposed below the first heating unit and on the first connector; the first connector is sheathed on the second connector and fixed by the fastener; the pneumatic switch is disposed in the fixed part; the fixed part is disposed in the fastener; the second connector is disposed at an inner side of the turnover member; the first spring is disposed on the turnover member; the turnover member is fixed on the main body via the fixing pin; the buckle is disposed on the side wall; the second spring is disposed on the buckle; and the turnover member is curved and fixed on the main body via the buckle and is capable of overturning outwards with respect to the main body by extension of the first spring.