The invention discloses a metal hydride hydrogen storage device with an efficient heat exchange effect and belongs to the technical field of hydrogen storage. The device consists of a valve, a protecting cover, an upper cover, sealing gaskets, bolts and nuts, a casing, hydrogen storage bottle bodies, hydrogen storage alloys, gas guiding pipes, unfilled corner square finned tubes, separation boards, hydrogen pipelines, ferrule groups, bottle mouth joints, bottle mouth sealing gaskets, bottle body fixing nuts, bottle body sealing gaskets, filter discs and a circulating inlet/outlet, wherein the multiple unfilled corner square finned tubes are arranged at the periphery of the hydrogen storage bottle bodies in a sleeving manner; channels for circulating water are formed between the unfilled corner square finned tubes and the separation boards; and the unfilled corners of the unfilled corner square finned tubes serve as a passage of circulating water. The metal hydride hydrogen storage device disclosed by the invention is simple in structure and is easy to manufacture and process; and compared with an existing similar metal hydride hydrogen storage device, the metal hydride hydrogen storage device disclosed by the invention has a better heat exchange effect and more excellent hydrogen desorption performance.