The invention discloses a high-gain gap array antenna based on a left-handed material, which is characterized in that the antenna has a multilayer structure and comprises three metal layers of a gap radiating layer (1), a feeding layer (2) and a reflecting layer (3); two air layers are formed among three metal layers; a coaxial joint (4) is used for feeding; the gap radiating layer (1) is formed by etching ringent resonant ring gaps (6) and rectangular narrow strip gaps (5) on the metal layer; the gaps form a periodic array as an antenna radiation unit; the feeding layer (2) comprises a T-shaped power splitting system (8) and a plurality of metal conduction bands (9); an input port of the T-shaped power splitting system in a coaxial feeding point (7) is connected with an inner conductor of the coaxial joint (4); each output port of the T-shaped power splitting system is connected with each metal conduction band (9) respectively; the metal conduction band is positioned right below each row of the ringent resonant ring; the gap radiating layer (1) and the reflecting layer (3) act as underground metal; the underground metal and the metal conduction bands (9) form a stripline transmission line. The high-gain gap array antenna has the advantages of high gain, simple manufacture and low cost.