Buried livestock farm sewage purification device

The utility model belongs to the field of breeding industry, and particularly relates to a buried farm sewage purification device which comprises a filter screen, a water inlet pipe is fixedly connected to one side of the filter screen, a protective shell is fixedly connected to the outer wall of the water inlet pipe, and a cover plate is fixedly connected to one end of the water inlet pipe. The lower part of the cover plate is fixedly connected with an anaerobic filter tank; the outer wall of the anaerobic filter tank is fixedly connected with a first connecting pipe; through cooperative work of a filter screen, a water inlet pipe, a protective shell, a cover plate, an anaerobic filter tank, a first connecting pipe, an aeration tank, a second connecting pipe, a water outlet valve and a disinfection sedimentation tank, the purification effect of the equipment is better guaranteed, and the protection effect is better when the equipment is buried underground; sewage is guided into the anaerobic filter tank by t