The invention discloses a blending tank for natural gas hydrate experiments and a method for storing natural gas hydrate, and particularly relates to a blending tank for natural gas hydrate experiments and applied to the field of natural gas hydrate experiments and a method for storing natural gas hydrate. The blending tank for natural gas hydrate experiments comprises a base, a tank body, a cover, a stirrer, a heating device, a nitrogen injection pipe, a saline water injection pipe, a slurry input pipe, a slurry output pipe and a nitrogen release pipe. The method for storing natural gas hydrate includes the following steps that hydrate powder is poured into the tank body; nitrogen is injected; the substances in the tank body are heated. By adopting the blending tank for natural gas hydrate experiments, the temperature in natural gas hydrate slurry is within ideal pressure and temperature ranges, and the natural gas hydrate slurry will not decompose and is capable of flowing and providing qualified natural gas hydrate for use in time.