The invention relates to a treatment process for diseased and dead domestic animal processing waste water. The treatment process comprises the following steps: S1, pretreating the waste water: enabling the waste water to be treated to successively pass through an adjusting pool and an oil separator, removing floated oil in the waste water, collecting into a slag collection pool, then introducing the waste water into a coagulation air float pool, removing suspended solids in the waste water, and collecting into a sludge pool; S2, denitrifying: introducing the waste water treated in the step S1 into a hydrolysis acidification pool, performing ammonification, then enabling the waste water to enter a biochemical pool, and denitrifying; S3, secondarily denitrifying and discharging: refluxing the waste water treated in the step S2 to the hydrolysis acidification pool by virtue of a reflux pump, repeating the step S2, introducing the secondarily denitrified waste water into a secondary sedimentation pool, and discharging. The treatment process has the advantages that the oil separator and the coagulation air float pool are cooperated to pretreat the waste water, then the waste water is denitrified by virtue of the biochemical pool additionally provided with a biological zone and honeycomb filler, and after the remaining suspended solids are removed by virtue of the secondary sedimentation pool, the water is discharged, so that the content of ammonium and nitrogen is decreased on the premise of no air stripping process.