The utility model relates to a device used for simulating a natural gas hydrate solid exploitation test, which is characterized in that the device comprises a vertical lifting pipe; the inlet at the lower end of the lifting end is connected with a material inlet bin and extends into the bin; the outlet of the upper end of the lifting pipe is connected with the upper part of a cylindrical separator; the bottom of the separator is provided with a turbine flowmeter and a solid grain weight-measuring device; the turbine flowmeter is connected with a liquid-level keeping water box; the solid grain weight-measuring device is connected with the inlet of the upper end of a grain recovery pipeline; the outlet of the lower end of the grain recovery pipeline is connected with a material inlet bin; the bottom of the liquid-level keeping water box is connected with the bottom of the material inlet bin by a pipeline; the vertical segment of the lifting pipe is provided with a plurality of gas injection pipelines which are provided with a plurality of gas injection holes communicated with the lifting pipe; the gas injection holes are connected in parallel with a gas output pipeline by the gas injection pipelines; and the gas output pipeline is connected with an air compressor by a rotor flowmeter and an air pressure adjuster. The utility model has the advantages of simple structure, convenient operation, exact simulation and the like, and can be applied to the laboratory simulation of ocean seepage-typed natural gas hydrate solid exploitation technology.