The invention discloses a visual carbon dioxide desublimation experiment device and belongs to the design field of a gas desublimation experiment device. The device comprises a desublimation device which is internally provided with a desublimation cavity used for realizing desublimation of carbon dioxide into dry ice and a gas inlet and a gas outlet communicating with the desublimation cavity, a cooling source used for providing cooling capacity to desublimation of the carbon dioxide, a temperature control assembly comprising a heat conduction member used for transmitting the cooling capacityof the cooling source to the heat conduction member in the desublimation cavity and at least one heating layer sequentially arranged on the heat conduction member, a measurement assembly used for measuring thickness of the dry ice of the desublimation cavity, and a controller used for adjusting temperature of a low temperature wall surface of the desublimation cavity through the controlled temperature assembly. The device is advantaged in that the carbon dioxide gas generates desublimation at the wall surface of the desublimation cavity, the temperature control assembly is controlled for controlling the wall surface temperature of the desublimation cavity, so the carbon dioxide is made to generate desublimation on the wall surface under the temperature, the measurement assembly is used formeasuring thickness of the dry ice, and desublimation rules of the carbon dioxide under different temperatures are acquired.