The invention discloses a composite right and left hand leaky wave antenna. The antenna comprises N composite right and left hand waveguide units which are cascaded in a linear mode, an upper surface of each composite right and left hand waveguide unit is vertically provided with a long slit, and biasing between the long slit and a slit of a wide edge center line of the composite right and left hand waveguide unit is xd. Compared with a planar CRLH leaky wave antenna in the prior art, the CRLH leaky wave antenna has advantages of low loss, high radiation efficiency and high power capacity, integration of an antenna directional diagram can be flexibly carried out, an directional diagram sidelobe level can be optimized, and directional diagram performance is improved. The invention further provides a composite right and left hand leaky wave antenna integration method.