The invention relates to the technical field of aerosol tests in containment vessels, and particularly discloses a sampling device for an aerosol migration mechanism test. The sampling device comprises a sampling head, a sampling connecting pipe and a sampling pipe, wherein the sampling head is of a shell cavity structure, a plurality of gas inlet holes are evenly formed in the sampling head, oneend of the sampling head is an integrally-formed cylindrical sampling pipe connecting pipe, and the sampling pipe connecting pipe is fixedly arranged at the end portion of the sampling pipe in a detachable mode; and the sampling head can be used for roiling sampled gases entering a cavity of the sampling head via the gas inlet holes, so that the sampled gases are uniformly mixed. According to thesampling device, the defects of the existing straight pipe type sampling head in an aerosol migration mechanism test are overcome; the spherical, cylindrical and disc-shaped sampling head structures are adopted, holes are evenly formed in the surface of the sampling head structures, 360-degree sampling and gas inlet is formed, disturbance of the surrounding gas flow is reduced, and uniform mixingof gases in the sampling head can be realized, thereby improving the measurement precision.