The invention discloses a ground penetrating radar layer data file processing and charting method. The method comprises the steps of selecting to-be-processed ground penetrating radar layer data files; importing the data files to Excel; importing layer thickness data information to the Excel and obtaining secondary lining thickness values of the files; identifying a detection part and a corresponding mileage section, and storing the secondary lining thickness values in a position determined through identification in a data source region; taking lower layer thickness files of a folder as a batch, and performing layer data file processing in sequence according to the abovementioned steps; drawing a first picture group; changing title elements of pictures in the picture group to enable the changed pictures to become curve charts suitable for a new detection object; according to the mileage lengths of all picture groups, calculating out a quantity of the curve charts; repeating copying, pasting and modification of the first picture group to generate a main curve chart; and performing storage and naming to form a result file. According to the method, batch processing of the to-be-processed ground penetrating radar layer data files is realized; and data processing is organically combined with charting, so that the working efficiency is improved and the misoperation is avoided.