Mixed wastewater can be added in proportion through simulation experiments, and the best mixing ratio can be found by comparing the effects of each group. Kitchen waste wastewater is a kind of complicated wastewater which is difficult to treat. Excessive mixing may affect the effluent index. Pretreatment of kitchen wastewater before mixing can not only reduce the pollutants, but also improve the biodegradability of kitchen wastewater. In the pretreatment, an appropriate amount of demulsifier can be added, which can achieve good results.