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Anaerobic digestion is one of the most efficient methods for pig manure management. In this study, methane measurement of a liquid fraction obtained from 0.1 mm sieve mesh filtration and raw pig manure was conducted, and the corresponding dynamic evolution of metabolites and microbial community structure was investigated. The results showed that the liquid fraction filtered through a 0.1 mm sieve mesh gave a maximum methane production yield of 468.13 mL‐CH₄/g‐VS_added, 4.50‐times higher than raw pig slurry after 60 days. This result indicates that the 0.1 mm sieve filtration effectively provided an appropriate concentration of biodegradable compounds for high methane production in the slurry. Interestingly, the filtrates from 0.1 mm sieve mesh initially produced a high amount of volatile fatty acid, which later considerably decreased the concentrations of acetic and butyric acids on the day when …