An air cleaner, comprising: a first air cleaning module including a first fan, a first filter, a first inlet through which air is suctioned in a radial direction into the first filter, and a first outlet; a second air cleaning module provided over the first air cleaner including a second fan, a second filter, and a second inlet through which air is suctioned in the radial direction to the second filter; and an air flow controller coupled with the second air cleaning module and including a third fan to control a flow of the air discharged from the second air cleaning module, and a second outlet, characterized in that: the first air cleaning module and the second air cleaning module are stacked in a vertical direction, the air cleaner further comprises a divider provided between the first air cleaning module and the second air cleaning module to separate the first air cleaning module from the second air cleaning module, wherein the second air cleaning module is positioned at the upper side of the first air cleaning module and spaced apart therefrom by the divider, the first outlet guides an upward discharge of a first airflow having passed through the first fan, and the second outlet guides an upward discharge of a second airflow having passed through the third fan, and the first airflow discharged from the first outlet and the second airflow discharged from the second outlet each have an independent flow. a first air cleaning module including a first fan, a first filter, a first inlet through which air is suctioned in a radial direction into the first filter, and a first outlet; a second air cleaning module provided over the first air cleaner including a second fan, a second filter, and a second inlet through which air is suctioned in the radial direction to the second filter; and an air flow controller coupled with the second air cleaning module and including a third fan to control a flow of the air discharged from the second air cleaning module, and a second outlet, characterized in that: the first air cleaning module and the second air cleaning module are stacked in a vertical direction, the air cleaner further comprises a divider provided between the first air cleaning module and the second air cleaning module to separate the first air cleaning module from the second air cleaning module, wherein the second air cleaning module is positioned at the upper side of the first air cleaning module and spaced apart therefrom by the divider, the first outlet guides an upward discharge of a first airflow having passed through the first fan, and the second outlet guides an upward discharge of a second airflow having passed through the third fan, and the first airflow discharged from the first outlet and the second airflow discharged from the second outlet each have an independent flow. the first air cleaning module and the second air cleaning module are stacked in a vertical direction, the air cleaner further comprises a divider provided between the first air cleaning module and the second air cleaning module to separate the first air cleaning module from the second air cleaning module, wherein the second air cleaning module is positioned at the upper side of the first air cleaning module and spaced apart therefrom by the divider, the first outlet guides an upward discharge of a first airflow having passed through the first fan, and the second outlet guides an upward discharge of a second airflow having passed through the third fan, and the first airflow discharged from the first outlet and the second airflow discharged from the second outlet each have an independent flow.