A movable air purification robot system may automatically eliminate dust, bacteria and smell from air while freely moving along a polluted area irrespective of a space dimension. The movable air purification robot system includes an air purification robot which has an air pollution detector detecting pollution and humidity of floating substances contained in air, an air purifier circulating the air containing pollutants by means of the air pollution detection unit and filtering, absorbing and purifying the same, a robot propulsion unit formed of two driving wheels disposed at both lower sides of a robot body and independently operating, an obstacle detector detecting obstacles a robot user interface allowing a user to operate the robot, a robot control unit controlling the operations of each element, and a power unit supplying electric power to operating elements.