The utility model relates to a windproof device of a smoke adding device. The windproof device comprises a smoke hood arranged at a smoke outlet of a smoke adding pipe of the smoke adding device, the inner surface of the smoke hood forms a smoke cavity, one end of the smoke hood is communicated with the smoke outlet of the smoke adding pipe, and the other end of the smoke hood covers a smoke-sensing detector in a simulation alarm test state. According to the windproof device of the smoke adding device, the smoke outlet of the smoke adding pipe is provided with the smoke hood, testing personnel can make the smoke hood cover the smoke-sensing detector in the simulation alarm test state, and smog exhausted by the smoke adding pipe gathers in the smoke hood so that the smog is prevented from being blown away by the wind, and the accuracy of smog tests can be guaranteed even the test is conducted at a ventilating place.