Transparent conductive electrode (TCE) is one of the necessary components in optoelectronic devices. However, as the demand for cost-effective, lightweight, and flexible electronic devices increases, conventional TCE materials based on metal oxides have several problems such as scarcity of indium and brittleness. Therefore, it is required to develop the next-generation TCE materials. In this point of view, we previously developed highly conducting carbon nanosheet (CNS) through simple solution-processing of polymeric carbon precursors. However, there is still a need to improve electrical and optical properties for a wide range of applications of CNS electrodes. In this work, we developed CNS with micromesh structure to improve TCE characteristics of the CNS via phase-separation of immiscible blend precursors. The facile approach without any-time consuming patterning processes can improve trade-off between sheet resistance and optical transmittance of conventional CNS.