The invention discloses a ventilation air methane adsorber. The ventilation air methane adsorber comprises a closed adsorber box body, wherein a plurality of adsorption filtering cores are arranged in the adsorber box body, a ventilation air inlet pipeline and an enriched gas outlet pipeline are arranged at the bottom of the adsorber box body respectively, a hot air inlet pipeline and an emptying pipeline are arranged at the top part of the adsorber box body respectively, an upper guiding partition plate and a lower guiding partition plate, which are provided with air holes, are arranged in the adsorber box body, the adsorption filtering core is arranged between the upper guiding partition plate and the lower guiding partition plate and comprises a filtering core framework and an adsorption material, the filtering core framework comprises a tubular inner framework and a tubular outer framework, a plurality of air holes are formed in the walls of the tubular inner framework and the tubular outer framework, and the adsorption material is arranged between the inner framework and the outer framework. The ventilation air methane adsorber utilizes the methane adsorption material to adsorb methane at normal temperature and desorb at high temperature, adopts the temperature swing adsorption process to concentrate ventilation air methane, and can remarkably reduce the system energy consumption compared with the method adopting the pressure swing adsorption.