The invention provides a sedimentary basin type underground heat resource classification method. The method comprises the steps that 1) tectonic zones of a sedimentary basin are divided by utilizing well drilling, logging, well logging and earthquake data and the like; 2) lithological combination and thickness of the stratum are determined for different tectonic zones; 3) the thermal conductivities of different lithological stratums are made clear via rock core sampling test; 4) shaft temperature measuring data of the tectonic zones is obtained, and distribution of the ground temperature gradient is determined according to the shaft temperature measuring data; 5) the ground heat flow value is calculated by utilizing the thermal conductivities of different lithological stratums and the ground temperature gradient comprehensively via a geothermic formula, and the planar distribution rule of the ground heat flow value is made clear; and 6) sedimentary basin type underground heat resource is classified according to the planar ground heat flow value. The method is highly operable, and can be used to provide more accurate methods and materials for research on geothermal reservoir reasons, evaluation of underground heat resource amount and research on development and utilization area selection of the underground heat resource.