We　report　a　low-cost　and　effective　technique　for　preparing　borax　from　boron-bearing　tailings,　which　is　at　a　low　grade　of　9.98%　B2O3.　Well-crystallized　borax　is　achieved　by　the　removal　of　impurity,　evaporation　and　concentration　through　the　efficient　method　of　sodium　roasting　and　pressure　leaching.　The　morphology,　composition　and　structure　of　borax　are　investigated　in　this　study.　The　result　of　scanning　electron　microscopy　shows　that　the　crystals　obtained　are　cube-shaped　with　smooth　surface　and　of　good　growth.　The　crystals　are　proven　to　be　Na2B4O7　center　dot　10H(2)O　by　EDS,　XPS,　XRD　and　ICP-AES.　Moreover,　the　recovery　rate　of　boron　can　reach　63.49%.　This　cost-effective　strategy　of　preparing　borax　from　boron-bearing　tailings　provides　a　guideline　for　the　development　of　the　boron　industry　and　has　a　great　potential　for　the　commercialization　of　borax　production.