3D printing device capable of controlling temperature field and used for testing diffusion coefficient of soil body

The invention discloses a 3D printing device capable of controlling temperature field and used for testing the diffusion coefficient of soil body, which comprises a diffusion chamber and a temperature field generator arranged on the upper part of the diffusion chamber, wherein the upper part of the diffusion chamber is provided with an annular baffle plate used for placing the annular knife for sampling. The temperature field generator comprises a shell, upper and lower groups of water bath pipes are arranged in the shell. The upper water bath pipe is respectively connected with an upper layer liquid inlet and an upper layer liquid outlet; the lower water bath pipe is respectively connected with a lower layer liquid inlet and a lower layer liquid outlet. The diffusion chamber is connected with a gas inlet and a gas outlet; and a layer for heat preservation is arranged outside the diffusion chamber. The invention can be used for researching the gas diffusion blocking performance of the soil body under the action of the temperature field. Figures