Medium-deep layer geothermal monitoring system and method

The invention discloses a medium-deep layer geothermal monitoring system which comprises an annular heat exchange pipe, a circulating pump, a temperature measuring device and a monitoring terminal device. The annular heat exchange tube comprises an outer tube and an inner tube; an annular pipeline is formed between the outer side wall of the inner pipe and the inner side wall of the outer pipe; a flowing medium is injected into the annular pipeline from an opening in the upper side of the outer pipe; the circulating pump drives a flowing medium to flow in the annular heat exchange pipe; the temperature measuring device circularly flows in the annular heat exchange tube along with the flowing medium and continuously measures and records geothermal temperature information; and the geothermal temperature information is sent to a monitoring terminal device. In addition, the invention further discloses a medium-deep layer terrestrial heat monitoring method. According to the geothermal information monitoring system