Abstract: To address the issues of complex structure, monofunctionality, and limited space coverage range of traditional reflectarrays and transmitarrays, a single-layer dual frequency dual-polarized transmit-reflect-array antenna is designed based on coding metasurfaces. It can achieve independent transmission and reflection beams with different polarization by reasonably arranging meat-atoms at higher and lower bands. Utilizing the proposed metasurface configuration, a transmit-reflect-array antenna consisting of 18×18 higher band elements and 19×19 lower band elements was designed, which generates<italic>x</italic>-polarized forward high gain beams in the θ=20° direction and <italic>y</italic>-polarized backward high gain beams in the θ=0° direction, respectively. The center frequencies of higher and lower bands are 35 GHz and 29 GHz. The experimental results show that the peak gains in the transmission and reflection modes are 24.6 dB and 25.2 dB, respectively, with 3-dB gain bandwidths reaching 28% and 27%, thereby validating the effectiveness of the design.. The proposed transmit-reflect-array antenna achieves full space coverage of the radiation beams with a single-layer configuration. Furthermore, it features simple structure, high integration, broad coverage, and high gain, demonstrating promising application prospects in long-distance communication systems such as satellite and radar.