The invention discloses a gradient deep dehumidifying method using micro channel rapid diffusion and nano wire adsorption, and more specifically relates to a technology used for further deep dehumidifying through metal micro channel inner dew point condensation phase change primary dehumidifying and nano wire micro channel adsorption. The technology is capable of reducing gas relative humidity tobe lower than 0.1% (20DEG C), and belongs to the field of ultra low humidity adjusting. The height of the adopted two micro channels is 1mm or lower, the nano wire structures are prepared through electroplating, nano wire diameter is controlled to be 1 to 1000nm, and the height is controlled to be 1 to 50m. According to the technology, because of rapid diffusion of water molecules in micro channels, and the adsorption characteristic of the nano wires, deep dehumidifying is realized.