The invention relates to a method of recovering rare-earth elements from oxalic acid precipitate rare-earth mother liquor. The method includes the steps such as examining, siphoning, supplementing, solid-liquid separating and dewatering; dewatered precipitate is recovered rare-earth elements. Resource waste may be avoided by efficiently recovering the rare-earth elements from the oxalic acid precipitate rare-earth mother liquor; by pretreating the oxalic acid precipitate rare-earth mother liquor, oxalic acid concentration is decreased and waste water treatment cost is lowered; the method is simple to operate and low in cost and has good economic and social benefits.