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water treatment system is very important in the waste plastic recycling plant. During the waste plastic recycling processing, for example, PET bottle washing, PE/PP film washing and plastic pelletizing, etc, a large quantity of water is required, if they can't be treated for recycling after using, the discharged dirty water will brings the more pollution to the land and rivers, as well as our daily life. By this water treatment system developed for plastic recycling industry, the dirty water will be treated with the following steps: 1, chemical PAC and PAM for acidification and flocculation treatment; 2, biological oxidation treatment; 3, filtering by quartz sands; 4 sludge drying by press machine. After the treatment flowchart, the dirty water from the plastic PE/PP/PET washing line or pelletizing line will become the clean water, which can be reused to the PE/PP/PET washing and pelletizing line, or discharged directly without any pollution.