The invention discloses a gassing experiment device and a gassing experiment method. The gassing experiment device comprises a gassing component provided with a gas inlet and a gas outlet, a gas measuring component connected with the gassing component and a vacuumizing component connected with the gas measuring component, a first valve is arranged at the gas inlet, and the gas measuring componentcomprises a gas measuring pipe provided with scale marks and a first branched pipe connecting the gas measuring pipe with the gas outlet; a second valve is arranged at the lowest scale mark of the gasmeasuring pipe and positioned at a first end of the gas measuring pipe, a third valve is arranged at the highest scale mark of the gas measuring pipe and positioned at a second end of the gas measuring pipe, a fourth valve and a pressure meter are arranged on the first branched pipe, and the pressure meter is arranged between the fourth valve and the gas outlet. During an experiment conducted bythe gassing experiment device, a lot of hydrogen does not need to be fed in to eliminate air in the whole device, and liquid injected into the gas measuring pipe can be recycled, so that experiment materials are saved, and experiment cost is reduced.