The utility model relates to a well circulation heat exchange tube in closed. It has been solved and has had technical problem such as trading the heat pipe heat exchange inefficiency now. Including a plurality of heat transfer wells, heat transfer body, the filtering layer that permeates water, the protective layer that permeates water, the open U type body of high -order pipe of open U type pipe and open U type pipe low level pipe has, the high -order pipe of open U type pipe and the upper end of open U type pipe low level pipe are all passed the waterproof concrete of setting in heat transfer body top and are recharged the module and be connected with first outside heat exchange tube, the high -order pipe lower extreme of open U type pipe is equipped with high -order water -permeable structure, the lower extreme that open U type pipe low level was managed is equipped with low level water -permeable structure, just high -order water -permeable structure is located low level water -permeable structure's top. The advantage lies in: strengthened the heat transfer volume of heat exchange tube, heat exchange efficiency is high, and the heat transfer volume is big, the pipe is gone into the well after adopting integral preparation, has improved body stability and has reduced the construction degree of difficulty, and is thermal -insulated effectual.