PROBLEM TO BE SOLVED: To treat used disposable diapers by reducing the processing cost required for processing the used disposable diapers, transporting the used disposable diapers as they are to a sewage treatment plant, and performing crushing treatment and separation and recovery treatment in the sewage treatment plant. Provision of a method for processing used disposable diapers and a processing system for used disposable diapers that can reduce such costs and effectively utilize the components of used disposable diapers as resources. A transport process for transporting used disposable diapers to a sewage treatment plant and a processing process for processing the used disposable diapers in the sewage treatment plant are provided, and the processing steps include a crushing step for crushing the used disposable diapers and a used diaper. A method for processing used disposable diapers and a processing system for used disposable diapers, which comprises a separation and recovery process for separating and collecting disposable diapers for each component. [Selection diagram] Fig. 1
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