The damping process of magnetic turbulence induced by the collisional merging of field-reversed configurations (FRCs) was investigated using the FAT-CM device at Nihon University. Two FRC-like plasmoids collided at super-Alfvénic and supersonic speeds. During the collision phase, intense magnetic turbulence developed and temporarily disrupted the FRC-like reversed magnetic field structure. Nevertheless, the plasmoids relaxed into an FRC-like state within several tens of microseconds. High-frequency turbulence components were rapidly damped, particularly under kinetic conditions, suggesting the possible involvement of kinetic effects in the damping process. Additionally, energy conversion from kinetic to magnetic and subsequently to thermal energy was observed. These results suggest that kinetic effects may play an important role in both the rapid damping of magnetic turbulence and the associated plasma heating during the collisional merging process.