Underground circulating heat collecting system and method for transforming deep abandoned mine

The invention relates to an underground circulating heat collecting system and method for transforming a deep abandoned mine, the underground circulating heat collecting system comprises a mine water treatment subsystem, a heat collecting subsystem and a heat exchange subsystem, the mine water treatment subsystem provides a heat collecting working medium for the heat collecting subsystem; mine water in the abandoned mine is collected and utilized as a circulating heat collection working medium to carry out whole underground heat collection circulation; the heat exchange subsystem is used for achieving cyclic utilization of a heat collection working medium and comprises a hot water bin, a power generation device, a condensation heat exchange device and a cooling heat exchange device which are all arranged in a roadway of the abandoned mine. And the heat collection subsystem is used for exploiting deep geothermal resources. Different from an existing single abandoned mine development and utilization mode, mine