The invention discloses a switching door which comprises a door leaf. A through hole is formed running through the two side faces of the door leaf is formed in the door leaf. Decorative cover plates are arranged at holes in the two ends of the through hole, and a gap through which air flows is reserved between the through hole and the decorative cover plates; the switching door further comprises an air purifying device arranged inside the through hole and comprises a dust removal device and an exhaust device arranged on one side of the dust removal device; when the switching door is in use, the air purifying device is started, air entering or exiting from a room is made to pass through the dust removal device through the exhaust device, and therefore dust in air is removed, and indoor airis purified. It can be seen that the air purifying device is arranged inside the switching door, the function of partitioning the room is achieved, air entering the room can be purified, the indoor space cannot be occupied, the additional value and the indoor space utilization rate of the switching door are increased, and the user experience is improved.