The invention relates to an indoor air purification method. The indoor air purification method comprises the following steps: carrying out haze removal and formaldehyde removal purification treatmenton indoor air by virtue of negative ions generated by an air purification system; carrying out sterilization and disinfection treatment on the indoor air by virtue of ozone generated by the air purification system; and removing the ozone in the indoor air by virtue of the air purification system after the sterilization and disinfection treatment, wherein the air purification system comprises a haze removal, formaldehyde removal and sterilization module, and an ozone treatment module. According to the indoor air purification method, the haze removal and formaldehyde removal purification treatment or the sterilization and disinfection treatment is carried out according to an indoor use condition and an indoor air condition, then the sterilization and disinfection treatment is carried out byvirtue of the ozone, and then the ozone removal treatment can be carried out according to an indoor ozone concentration, so that the ozone left in air is prevented from causing harm to bodies; and after the haze removal and formaldehyde removal treatment, the sterilization and disinfection treatment, and the ozone removal treatment, the indoor air condition can be improved, and indoor virus spreading due to a too high haze concentration or germ residual is avoided.