The invention discloses a process for manufacturing an environment-friendly degradable plastic bag. The process comprises the following steps: stirring poly(terephthaloyl-p-phenylene diamine) fibers,formaldehyde, potassium tert-butoxide and dimethyl sulfoxide, adding bromopropane into the mixture, keeping on stirring, adding water into the mixture until precipitate is completely separated, performing filtering, washing and freeze-drying, adding N,N-dimethyl formamide into the mixture, adding alpha-methacrylate-omega-azido-terminated polyalkylene glycol and a catalyst into the mixture, performing reaction, and performing freeze-drying to obtain a first material; mixing polylactic acid and microcrystalline wax, heating the mixture to a molten state under a stirring state, adding the first material into the mixture, and performing uniform stirring to obtain a second material; adding polyethylene glycol, pulverized fuel ash, zeolite powder, diatomite, talc powder, tetrabutyl titanate andmethyl silicone oil into the second material under a stirring state, and performing uniform mixing to obtain a third material; and adding azodicarbonamide into the third material, performing uniform mixing, and performing blow molding to obtain an environment-friendly degradable plastic bag.