Temperature change test box with smoke sensing device

The utility model relates to a temperature change test box with a smoke sensing device. A front cavity and a rear cavity are arranged in a box body, a partition plate is arranged between the rear cavity and the front cavity, a centrifugal fan is arranged in the rear cavity, an air outlet of the centrifugal fan is located at the upper end of the partition plate and communicated with the front cavity, a return air inlet is formed in the lower end of the partition plate, and a first pipeline is arranged on the box body. One end of the first pipeline extends into the front cavity and is connected with a bent pipe, the open end of the bent pipe corresponds to the air outlet, the other end of the first pipeline communicates with the smoke sensing box, a smoke sensor is arranged in the smoke sensing box, the bottom of the smoke sensing box communicates with a second pipeline, and the second pipeline extends to the bottom of the rear cavity. The airflow generated by the centrifugal fan enables smoke in the test box t