The invention relates to a smell testing method. A testing device used in the smell testing method is matched with the seal edge of a container through a container cover to form a relatively-sealed environment, and smell diffusion is avoided; in the testing process, it is only needed to slightly push the container cover open by a small gap to conduct smell sniff and distinguish, a large amount of air can be prevented from entering the container, and the accuracy of the testing result is guaranteed. A support is arranged in the container, a sample holder is arranged on the support instead of being directly placed at the bottom of the container or directly placing a sample at the bottom of the container, and therefore when the influences of humidity on the smell of the material need to be tested, a proper amount of water can be added to the container, and the sample is not affected. A thermometer is arranged on the wall of the container and used for detecting the temperature in a containing cavity and displaying the temperature, in other words, the temperature displayed by the thermometer is the actual temperature in the container instead of the environment temperature or the temperature of a heating device, the sample smell difference caused by the temperature difference can be avoided, and the testing result is more accurate and reliable.