The invention provides a new hydro-thermal enclosed type underground heat resource quality classification evaluation method, comprising steps of calculating and determining distribution characteristics of ground temperature gradient and heat storage temperature according to temperature test materials obtained during the oil gas exploration process, determining thickness and permeability of heat storage sandstone through well logging, logging and test data which are obtained through the oil gas exploration process, determining heat generation power of a single well of each heat storage system, determining profit distribution intervals of heat generation power profit of various single wells and performing first-level classification dividing, determining heat flow supply parameter of various structures and performing second level classification dividing, and performing geothermal resource classification evaluation by integrating the first level and the second level classification dividing. The new hydro-thermal enclosed type underground heat resource quality classification evaluation method can realize quality classification evaluation of hydro-thermal enclosed type underground heat resource and provides a prerequisite condition for the following underground heat resource exploitation utilization and area selection.