The invention relates to a high-performance heat sink based on a directional carbon nanotube thin film and a fabrication method of the heat sink. The heat sink comprises a directional carbon nanotube thin film (4) and a copper plate (5), wherein microgrooves (7) are cut in the copper plate, the directional carbon nanotube thin film (4) is laid on the copper plate (5) along a direction perpendicular to the directions of the microgrooves (7), and the directional carbon nanotube thin film (4) is in close contact with top ends of side walls of the microgrooves (7). Under the same heating power condition, the heat sink has relatively obvious low balancing temperature compared with a general pure copper heat sink.