The utility model relates to a carbon nanotube field emission array with a focusing grid electrode, comprising a substrate, a grid electrode bottom electrode located on the substrate, an insulating layer film, a cancellate carbon nanotube array as a cathode, a point-like carbon nanotube array as a grid electrode, wherein the bottom electrode of the cancellate carbon nanotube array cathode is located on the insulating layer film, the insulating layer film is located between the bottom electrode of the cathode and the bottom electrode of the grid electrode, the point-like carbon nanotube is located at the center position of the cancellate hole of the cancellate carbon nanotube array, and point-like carbon nanotubes are electrically connected with the bottom electrode of the grid electrode. According to the technical scheme, each carbon nanotube unit in the carbon nanotube array is provided with a focusing electrode, thereby obtaining a field emission cathode with a small beam diameter of an electron beam. The carbon nanotube field emission array with a focusing grid electrode is suitable to field emission devices such as electron sources in an X-ray source, a microwave amplifier, a field emission scanning electronic microscope, etc., with high demands for the beam diameter of the electron beam.