The invention relates to a system for purifying air through an intelligent mechanical device and ecological plant landscapes in the field of ecological environments. The system is particularly used for improving the air quality of indoor environments, indoor decoration and decoration engineering, can conduct sterilizing, disinfecting, humidifying and dust removing on the indoor air and increasing the content of indoor natural oxygen and negative oxygen ions by actively controlling plant growth, a safer and more natural healthy environment is built for a space user, and the problem that a traditional air purifying manner completely depends on mechanical control is solved. The plant purifying system is suitable for being used in privacy or public environments such as homes, schools, hospitals, offices, business, museums and health maintenance and retirement organizations.