The invention relates to a kelp hanging, airing and drying device. The kelp hanging, airing and drying device comprises an air drying shed and a drying chamber which are arranged in sequence in the Xdirection; a horizontal guide rail is arranged at the part, under a transparent sunshine plate, at the internal top of the air drying shed in the X direction; an airing rack is fixedly arranged underthe horizontal guide rail in the X direction; a first elevator elevates an airing rod to a height larger than the height of the airing rack after the airing rod is firmly sucked, and then moves the airing rod moves in the X direction to place the airing rod in an initial placing position on the airing rack; after a second elevator reaches the initial position and elevates the airing rod to a position higher than the airing rack after firmly sucking the airing rod, the second elevator moves to a program setting position in the air drying shed; a turnover guide rail capable of smoothly jointinghorizontal guide rails of the drying chamber and the air drying shed is arranged at the docking part of the drying chamber and the air drying shed; and the second elevator can automatically convey theairing rods, on which kelp is hung, along the air drying shed and the drying chamber in sequence. According to the kelp hanging, airing and drying device, as two drying modes of air drying and heat pump drying are combined in an optimized manner, dehumidifying energy consumption is greatly saved, and the drying labor intensity of kelp is also reduced.