A splitter-detecting method, comprising: establishing (S201, S401) an integrated service digital network, ISDN, disturber power spectrum density, PSD, model; acquiring bit distributing parameters of digital subscriber line, xDSL, sub-carriers, and detecting whether an xDSL/ISDN splitter is absent according to the relation between the ISDN disturber PSD model and the bit distributing parameters of the xDSL sub-carriers; or acquiring a quiet line noise, QLN, of the xDSL line, and detecting whether the xDSL/ISDN splitter is absent according to the similarity between the ISDN disturber PSD model and the QLN of the xDSL line; wherein, the detecting whether the xDSL/ISDN splitter is absent according to the correlation between the ISDN disturber PSD model and the bit distributing parameters of the xDSL sub-carriers comprises: calculating a correlation coefficient between the ISDN disturber PSD model and the bit distributing parameters of the xDSL sub-carriers; determining whether an absolute value of the correlation coefficient is larger than a preset threshold value; and if so, determining that the xDSL/ISDN splitter is absent; wherein, the detecting whether the xDSL/ISDN splitter is absent according to the similarity between the ISDN disturber PSD model and the QLN of the xDSL line comprises: calculating the similarity between the ISDN disturber PSD model and the QLN of the xDSL line; determining whether the similarity is larger than a preset threshold value; and if so, determining that the xDSL/ISDN splitter is absent. establishing (S201, S401) an integrated service digital network, ISDN, disturber power spectrum density, PSD, model; acquiring bit distributing parameters of digital subscriber line, xDSL, sub-carriers, and detecting whether an xDSL/ISDN splitter is absent according to the relation between the ISDN disturber PSD model and the bit distributing parameters of the xDSL sub-carriers; or acquiring a quiet line noise, QLN, of the xDSL line, and detecting whether the xDSL/ISDN splitter is absent according to the similarity between the ISDN disturber PSD model and the QLN of the xDSL line; wherein, the detecting whether the xDSL/ISDN splitter is absent according to the correlation between the ISDN disturber PSD model and the bit distributing parameters of the xDSL sub-carriers comprises: calculating a correlation coefficient between the ISDN disturber PSD model and the bit distributing parameters of the xDSL sub-carriers; determining whether an absolute value of the correlation coefficient is larger than a preset threshold value; and if so, determining that the xDSL/ISDN splitter is absent; wherein, the detecting whether the xDSL/ISDN splitter is absent according to the similarity between the ISDN disturber PSD model and the QLN of the xDSL line comprises: calculating the similarity between the ISDN disturber PSD model and the QLN of the xDSL line; determining whether the similarity is larger than a preset threshold value; and if so, determining that the xDSL/ISDN splitter is absent. calculating a correlation coefficient between the ISDN disturber PSD model and the bit distributing parameters of the xDSL sub-carriers; determining whether an absolute value of the correlation coefficient is larger than a preset threshold value; and if so, determining that the xDSL/ISDN splitter is absent; wherein, the detecting whether the xDSL/ISDN splitter is absent according to the similarity between the ISDN disturber PSD model and the QLN of the xDSL line comprises: calculating the similarity between the ISDN disturber PSD model and the QLN of the xDSL line; determining whether the similarity is larger than a preset threshold value; and if so, determining that the xDSL/ISDN splitter is absent. calculating the similarity between the ISDN disturber PSD model and the QLN of the xDSL line; determining whether the similarity is larger than a preset threshold value; and if so, determining that the xDSL/ISDN splitter is absent.