The invention provides a telephone traceability method and device, relating to the field of big data. The telephone traceability method provided by the invention includes the following steps: obtaining multiple call signals of a calling number; determining feature tags of the calling number according to the call signal, wherein the feature tags of the calling number include incoming points of thecall signals, the distribution state of the call signal in each incoming point, acquisition areas of the call signals, and the distribution state of the call signal in each acquisition area; and determining information of boundary incoming points and boundary acquisition areas of the calling number based on the feature tags of the calling number and a predetermined strategy. By using the method, statistical analysis can be performed based on multiple call records of the calling number, the traceability of the calling number can be achieved, the process of acquiring the signal segment by segment for a calling process of a caller and performing a full-process matching operation on the acquired signal is not needed, the possibility of realizing the traceability of the calling number can be improved, and the telephone traceability efficiency can be improved.