The invention provides a recycling method of 10-methoxy-4H-benzo[4, 5]
cycloheptatriene[1, 2-b]
thiophene-4-
ketone mother liquid. The method includes: dissolving the mother liquid in an
organic solvent, rising temperature, adding a reductant into reaction liquid for reaction, thermally filtering after reaction is finished, concentrating to
dryness, adding a crystallizing
solvent for
crystallization to obtain high-purity 10-methoxy-4H-benzo[4, 5]
cycloheptatriene[1, 2-b]
thiophene-4-
ketone. The method can realize effective recycling of the mother liquid and is easy in control of reaction process and needless of complex special equipment; impurities in the mother liquid are converted through reductive reaction, thereby being able to be separated and purified through a simple crystallizing method.