The invention relates to an auxiliary device for repelling mosquitoes and concretely relates to a safe mosquito-repellent incense combustion box comprising a mosquito-repellent incense combustion box body. Concretely, the safe mosquito-repellent incense combustion box is designed in a way that a box body of a common mosquito-repellent incense combustion box is heightened and deepened; round ventilating holes are formed in the upper part of the box body wall; and a box lid is manufactured to be matched with a box port. Ignited mosquito-repellent incense is placed in the box body and then the box lid is well placed; and air can be exchanged via the ventilating holes, so the mosquito-repellent incense cannot burn out and mosquitoes can be repelled via smoke produced by mosquito-repellent incense combustion. The beneficial effects are that the safe mosquito-repellent incense combustion box is simply structured, convenient to use and safe and clean.