The utility model discloses an eliminate device of on - -spot smell in recovery work district, including tail gas return line, tail gas cleaning device, nitrogen gas diluting device, the tail gas pipeline replaces exhaust stack, breather valve and blast air district, ammonia still process district, crude benzol district, each groove logic of desulfurization district to be connected to the preceding pipeline of air -blower, forms loop -locked tail gas recovery system, tail gas cleaning device sets up the residue groove in hypomere water sealed tank, crude benzol district on middle groove of the tar that the blast air was distinguished and the cold ware of play, the rich solution groove department that the desulfurization was distinguished respectively, nitrogen gas diluting device sets up the condensation cistern department in the desulfurization district. The beneficial effects are that: can realize that chemical industry operation area tail gas is retrieved and hazardous gas's zero release, avoid the direct atmospheric dilution of tail gas to cause the accident potential of catching fire, the on -the -spot smell of cancel job reduces its harm to staff's health, and environmental protection profit is huge, has also increased sulphur ammonium, the light benzole, vitriolic output simultaneously.