The utility model discloses a fecaluria separator and metabolism cage for domestic animal nutrition research. Fecaluria separator includes the bottom plate and sets up in the curb plate on bottom plate both sides that the bottom plate encloses the grooving form with the curb plate on both sides, the bottom plate front portion is equipped with out the urine mouth, the elevation that the bottom plate internal surface is close to urine mouthful one end is less than the elevation that urine mouthful one end was kept away from out to the internal surface, the elevation that the curb plate internal surface is close to urine mouthful one end is less than the elevation that urine mouthful one end was kept away from out to the internal surface, bottom plate internal surface middle part and rear portion all are equipped with the excrement and urine baffle, and excrement and urine baffle bottom is equipped with the aperture, it is equipped with the fodder baffle to go out an urine mouthful top. The utility model discloses a fecaluria separator can realize the clean separation of domestic animal excrement and urine and urine, solves the separately problem of collection of excrement and urine and urine, provides safeguard for the experimental result of accuracy.