The invention relates to an intelligent gas-exchange alarming apparatus based on SF<6> gas detection. The intelligent gas-exchange alarming apparatus includes an access control system, an SF<6> concentration detector, a monitoring host, an alarm device, a blower fan, and a power supply, the monitoring host is electrically connected with the access control system to receive the door opening driving signal, the monitoring host is electrically connected with the SF<6> concentration detector to trigger the SF<6> concentration detector to perform concentration detection, the monitoring host is electrically connected with the alarm device to trigger the alarm device to give an alarm, the monitoring host is electrically connected with the blower fan to control the blower fan to perform gas exchange, and the power supply is electrically connected with the access control system, the SF<6> concentration detector, the monitoring host, the alarm device, and the blower fan to supply power to the access control system, the SF<6> concentration detector, the monitoring host, the alarm device, and the blower fan. The access control system and the SF<6> concentration detector are adopted to perform linkage control of indoor alarming, the alarm needs are met, and the control intelligence and flexibility are high.