The utility model relates to a multi-stage
sewage treatment device which comprises a multi-stage
sewage treatment device body, the multi-stage
sewage treatment device body is provided with a filter chamber and an
ultraviolet sterilization and disinfection chamber, and the multi-stage
sewage treatment device body is further provided with an overflow channel overflowing from the filter chamber to the
ultraviolet sterilization and disinfection chamber. The
ozone treatment device is characterized in that a strip-shaped gas overflow groove body for overflowing
ozone is arranged in the lower end of the overflow channel in an inverted buckling manner, and the length direction of the strip-shaped gas overflow groove body is consistent with that of the overflow channel, and a
brush stirring roller is horizontally arranged in the upper end of the overflow channel; and the axial direction of the
brush stirring roller is consistent with the length direction of the overflow channel. According to the utility model, not only is
ozone sterilization added, but also the ozone can act on the sewage very comprehensively and effectively, so that the sewage can be sterilized and disinfected very comprehensively and effectively, and the
treatment quality of the sewage can be improved greatly.