An air anomaly alarming method, an air anomaly alarming device and a storage medium are provided. The method includes: air composition information of an indoor environment is acquired; the air composition information of the indoor environment is compared with corresponding air composition information in a pre-acquired air change pattern; and an alarming message is sent to preset target equipment when a difference between the air composition information of the indoor environment and the corresponding air composition information in the air change pattern is greater than a first preset air threshold value.