The invention discloses an indoor air purification robot and a purification method thereof. The indoor air purification robot comprises an air purifier, wherein a box body is fixedly connected to thebottom of the air purifier; and a storage battery is fixedly connected to an inner cavity of the box body. According to the indoor air purification robot and the purification method thereof, through cooperative use for the arranged air purifier, groove, floor sweeping robot, box door, box body, first frame, first filter screen, air inlet pipe, touch screen, transparent shell body, intelligent ballmachine, exhaust fan, negative oxygen ion generator, ultraviolet sterilization lamp, flow guide cover, air outlet pipe, second filter screen, second frame, storage battery, water inlet pipe, pipe cover, transparent plastic pipe, partition, pipeline, air blower, floor mopping foam block, spray head, second connection pipe, water pump, first connection pipe, water tank, installation plate, fixed shell, spring, slide plate, movable block and connection plate, the problem of excessively single function of an existing indoor air purification robot is solved; and the indoor air purification robot has the advantage of multifunctionality.