The present invention relates to a vertical relay fluid storage barrel installed with fluid inlet and fluid outlet for whole or in part placement into natural thermal energy body in vertical or downward oblique manner, wherein a thermal energy exchanger is installed inside the relay fluid storage barrel temporarily storing thermal conductive fluid for external flow, the thermal energy exchanger is installed with fluid piping for the thermal conductive fluid passing through, to perform heat exchange with the fluid in the relay fluid storage barrel, and the fluid in the relay fluid storage barrel performs heat exchange with the natural thermal energy body.