The utility model discloses a liftable exhaust hood, which comprises an exhaust hood. The exhaust hood is fixed to the tail end of an exhaust hood support, an electric hoist is connected to the top end of the exhaust hood support, and exhaust hood support pulleys are disposed on two sides of the exhaust hood. When the electric hoist works, the exhaust hood support is pulled, and the exhaust hood support pulleys move along a guide rail. A motor support is mounted at the top end of the guide rail, the electric hoist is disposed on the motor support, and the edge at the bottom of the exhaust hood is flanged inwardly to form an oil collecting groove. The liftable exhaust hood solves the problem that an existing exhaust hood which is fixedly mounted cannot move, simultaneously solves the problem that the existing exhaust hood can not collect small solid-liquid particles in waste gas to cause pollution, is convenient in use as the exhaust hood can move up and down, can recycle liquid drops and the small solid particles in the waste gas, and prevents pollution to products.