Odor resource recycling treatment system for sewage treatment plant

The invention relates to the technical field of sewage odor treatment, and provides a sewage treatment plant odor resource circulation treatment system which comprises a sewage treatment passage and an odor circulation loop, and the sewage treatment passage comprises a pretreatment unit and a biochemical treatment unit which are communicated in sequence; the odor circulation loop comprises an odor passage of the pretreatment unit, an odor passage of the biochemical treatment unit, a second chemical washing unit, a biological filter unit and a fresh air supplementing unit which are communicated in sequence, and odor flows along the odor circulation loop from the pretreatment unit and forms purified air in the biological filter unit; and when the purified air does not reach the emission standard or the pressure of the odor resource recycling treatment system of the sewage treatment plant does not exceed the set pressure value, the purified air enters the fresh air mixing unit to be mixed with fresh air and then