Anesthetic gas recovery device for anesthesia machine

The invention discloses an anesthetic gas recovery device for an anesthesia machine. The anesthetic gas recovery device comprises a bottom plate, wherein the upper surface of the bottom plate is fixedly connected with a box body, the internal wall of the bottom of the box body is fixedly connected with a filter box, the upper surface of the filter box is fixedly connected with a stepping motor, an output end of the stepping motor is fixedly connected with a stirring shaft, a rotating rod is arranged on the surface of the outer side of the bottom end of the stirring shaft, and a rotary drum is arranged at the outer end of the rotating rod. The stirring shaft is driven by using the stepping motor, then, the rotary drum and water absorption sponge can rotate to absorb vapor from recovered anesthetic gas, thus, the gas can be dryer, and the filtering effect can be better; the gas is filtered through a double-layer activated-charcoal adsorption plate, impurities inside the gas are removed and recovered, and the im