Sewage treatment device for expressway service area

The utility model discloses an expressway service area sewage treatment device, which comprises a filter tank, a biological tank and a disinfection sedimentation tank which are connected in sequence, the filter tank comprises a water inlet pipe, a filter screen frame is detachably arranged in the filter tank, the filter screen frame comprises a filter screen, the filter tank is connected with the biological tank through a first pipeline, and the biological tank is connected with the disinfection sedimentation tank through a second pipeline. The biological tank is connected with the disinfection and sedimentation tank through a second pipeline, the disinfection and sedimentation tank comprises a second drainage pipe and a slag discharge pipe, proper filter screen models and numbers can be selected according to actual requirements, disassembly, assembly and replacement are convenient, a good sewage treatment effect can be achieved through the biological tank and the disinfection and sedimentation tank, the stru