Abstract: Clarifying the carbon emission and energy efficiency characteristics of various coke oven gas hydrogen production technologies is of great significance for regional low-carbon hydrogen path planning and the green transformation of coking industry.The life cycle assessment method is adopted to quantitatively evaluate and horizontally compare three mainstream technical routes, namely direct hydrogen production from coke oven gas (Route A), steam catalytic reforming hydrogen production from coke oven gas (Route B), and cryogenic separation co-production hydrogen production from coke oven gas (Route C). Four core indicators including carbon emission, energy consumption, energy efficiency and hydrogen recovery rate are analyzed emphatically, followed by uncertainty and sensitivity analysis to select the optimal process route. The results show that: (1) In terms of carbon emissions, Route C has the lowest carbon emission of 5.09kgCO?/kgH?, Route B has the highest value of 15.46kgCO?/kgH?, and Route A is in the middle with 13.59kgCO?/kgH?; (2) In terms of energy efficiency and hydrogen recovery rate, Route C achieves the highest total energy efficiency of 86.01%, Route B can realize incremental hydrogen output with a hydrogen recovery rate of 161.19%, while Route A ranks the lowest in both indicators; (3) In terms of process optimization, Route A owns the maximum carbon emission reduction potential of 68.57% relying mainly on the resource utilization of stripped gas. The key carbon reduction measures for Route B and Route C are cascade steam utilization and clean power substitution, with maximum carbon reduction potentials of 50.00% and 49.61% respectively. The study reveals that Route C is the optimal low-carbon hydrogen production route at present; waste heat recovery, green electricity substitution and resource utilization of by-product gas can greatly improve the low-carbon competitiveness of all technical routes.