Lifting type exhaust hood

The utility model discloses a lifting type exhaust hood, which comprises a fixed pipe and a movable pipe sleeved in the fixed pipe, the movable pipe can perform vertical lifting displacement relativeto the fixed pipe, the lower end of the movable pipe is connected with the exhaust hood, the exhaust hood is connected with a lifting traction rope, and the lifting traction rope is connected with a lifting traction rope. And the lifting traction rope is connected with the electric hoist after bypassing the fixed pulley. According to the lifting type exhaust hood, through the lifting device, vertical lifting of the exhaust hood can be integrally achieved, the exhaust hood can be integrally lifted in the non-working period, the ventilation system draught fan can be automatically closed throughthe switch, the exhaust hood integrally descends in the working period and is close to a pollution source as much as possible, the ventilation system draught fan is started through the switch, and theventilation effect is impr