The invention relates to a method for recovering clavulanic tert-butylamine salt from crystallization mother liquor. The method disclosed by the invention comprises: firstly, concentrating clavulanictert-butylamine salt crystallization mother liquor in a reduced pressure distillation mode under the condition of a low temperature, simultaneously recovering ethyl acetate and methyl alcohol, then carrying out cooling crystallization, and after filtering, obtaining crude products of the clavulanic tert-butylamine salt; secondly, dissolving the crude products of the clavulanic tert-butylamine saltby adopting methyl alcohol, and in modes of activated carbon decoloration, ethyl acetate crystallization and the like, obtaining the clavulanic tert-butylamine salt of which quality accords with thestandard. When the clavulanic tert-butylamine salt in the mother liquor is recovered by adopting the process disclosed by the invention, not only can new economic benefits be increased, but also the crystallization mother liquor is recycled, wastewater zero emission is implemented, and environmental-friendly clean green production is ensured.