A general-anesthesia waste gas purifier comprises a base, support rods, a frame, a baffle device, a gas inlet device, a gas outlet device and a purification device, wherein the frame comprises a transverse plate, a first through hole, a second through hole, a third through hole, a fourth through hole, a transverse rod and first filter hair; the baffle device comprises a baffle, a connecting rod, a holding rod, a horizontal plate and a positioning plate; the gas inlet device comprises a gas inlet pipe, a first fan, a first gas valve, a first filter net, a residue discharge pipe and a second gas valve; the gas outlet device comprises a first gas outlet deice and a second gas outlet device, the first gas outlet device comprises a first gas outlet pipe, a second fan and a third gas valve, and the second gas outlet device comprises a second gas outlet pipe, a third fan and a fourth gas valve; the purification device comprises a first purification device body, a second purification device body and a fixing rod, the first purification device body comprises a first vertical plate, a first heating rod, a first filter plate and second filter hair, and the second purification device body comprises a second vertical plate, a second filter plate, third filter hair and a second heating rod.