The invention discloses an automatic extraction method for on-batch river cross section morphology data. A cross section end point coordinate extraction module. dvb, a landform coordinate data extraction module. dvb and a cross section data extraction module. f90 are used, wherein cross section data extraction is based on landform coordinate data. The automatic extraction method comprises the following steps: automatically extracting a cross section end point coordinate and a cross section number; extracting river landform coordinate data; according to an obtained cross section position and landform coordinate data, extracting cross section morphology data. By adopting the automatic extraction method, multiple limits of feature contour lines in the aspects such as contour line deficiency, elevation deficiency and manual contour line drawing can be overcome, and defects that a contour line cross section method and a self-drawn contour line cross section method are relatively tedious in cross section extraction process, the precision is hard to ensure, a relatively long time is needed, very huge workload is implemented and the task is very heavy can be overcome; the automatic extraction method has the advantages that a great amount of cross section data can be automatically extracted, the working time can be shortened, the working task quantity can be reduced and the working efficiency can be greatly improved.