Abstract: With rapid adoption of 800 V high-voltage platforms in new energy vehicles, the standard system for high-voltage cables is facing new challenges. In the paper, technical differences between international standards such as ISO 19642 series and SAE J1654: 2021, and domestic standards such as GB/T 25085 series and QC/T 1037—2016, are compared and analyzed. It is pointed out that international standards place more emphasis on the accumulation of practical application data and rapid updates during their development. The newly released GB/T 25085.9—2026 and GB/T 25085.10—2026 have respectively adopted ISO 19642-9: 2019 and ISO 19642-10: 2019, marking that China has achieved textual alignment with international standards in terms of technical requirements for 800 V high-voltage cables. However, the adoption model not only introduces advanced international experience but also inherits its technical gaps (such as du/dt withstand capability and multi-stress coupling testing). Furthermore, the applicability of optional clauses in international standards (such as the 175 ℃ temperature class) needs to be further verified based on local operating condition data. Therefore, combined effects of temperature, electric field, mechanical stress, and cooling medium should be considered in testing. It is recommended to add du/dt withstand capability requirements in future standard revisions, clarify application scenarios of the 175 ℃ high-temperature class, establish multi-stress coupling test methods, and improve coordination and update mechanisms among standards. The research can provide a reference for the improvement of China's high-voltage cable standard system.