The invention relates to a gas hydrates solid state exploiting experiment simulation device, which is characterized by comprising a vertical lift pipe, wherein an inlet on the lower end of the lift pipe is connected with a feed bin and extends into the feed bin; an outlet on the upper end of the lift pipe is tangentially connected with the upper part of a cylindrical separator; the bottom of the separator is provided with a turbine flowmeter and a solid state particle weight-measuring device; the turbine flowmeter is connected with a liquid level holding water tank; the solid state particle weight-measuring device is connected with an inlet on the upper end of a particle recovery pipeline; an outlet on the lower end of the particle recovery pipeline is connected with the feed bin; the bottom of the liquid level holding water tank is connected with the bottom of the feed bin through a pipeline; a vertical section of the lift pipe is provided with a plurality of gas injection pipelines;each gas injection pipeline is provided with a plurality of gas injection ports communicated with the lift pipe; the gas injection ports are connected in parallel with a gas transmission pipeline through the gas injection pipelines; and the gas transmission pipeline is connected with an air compressor through a rotermeter and a gas-pressure regulator. The device has the advantages of simple structure, convenient operation, accurate simulation and the like, and can be applied to laboratory simulation of a sea seepage type gas hydrates solid state exploiting technology.