The present invention discloses a cooling apparatus for a linear motor comprising: a ‘U’ shaped stator back iron; a stator having a plurality of permanent magnets installed on inner facing surfaces of the stator back iron; a coil unit positioned between the stator and the permanent magnets with a predetermined gap; a movable unit having a movable unit back iron fixed on the coil unit, the movable back iron having at least one first air hole formed therein in a longitudinal direction and a first air nozzle linked to the first air hole for injecting cooling air from the top portion of the coil unit to the bottom portion; and a frame aligned at the lower portion of the coil unit having a second air hole formed in a longitudinal direction thereof for receiving the cooling air and a second air nozzle linked to the second air hole for injecting the cooling air from the bottom portion of the coil unit to the top portion.