The invention discloses a recyclable sewage treatment device and a treatment method, and belongs to the technical field of sewage treatment. The recyclable sewage treatment device comprises a supporting seat, a first treatment box and a second treatment box, the first treatment box and the second treatment box are both fixedly connected to the top of the supporting seat, and the recyclable sewage treatment device further comprises a supporting plate fixedly connected to the side wall of the first treatment box, a crushing box fixedly connected to the top of the supporting plate, and a heating plate fixedly connected to the inner wall of the crushing box and used for drying the garbage entering the crushing box for facilitating crushing of the garbage. Garbage in sewage can be dried and crushed after being screened, environmental pollution caused by direct discharge of the garbage is reduced, meanwhile, the garbage is dried, meanwhile, the sewage is heated, the buoyancy of the sewage is reduced, fine floccules which are not prone to sedimentation are rapidly settled, the cleaning effect is improved, and it is ensured that the treated sewage can meet the recycling requirement.