The invention discloses a method for recycling obsolete waste in informal landfills, which consists of excavation and transportation, comprehensive sorting, and material disposal; in the excavation and transportation, stabilization treatment is carried out according to the characteristics of the obsolete waste , to avoid the leakage of toxic substances; in the comprehensive sorting stage, the screening, manual sorting, crushing, magnetic separation, and winnowing processes are combined, and the operating parameters are optimized to efficiently separate the magnetic substances, humus, and Recyclable substances, combustibles and toxic and harmful substances realize the precise sorting and classification of available resources in stale garbage, and at the same time optimize the combination of devices to improve the effect of manual sorting and screening; the technical solution of the present invention realizes the reduction of stale garbage At the same time, it also frees up valuable space for the closed landfill to accommodate new domestic waste, and alleviates the need for new landfills to fill the growing domestic waste. The economic pressure and social pressure of burying the site.