Polyglycolic acid composition as well as preparation method and application thereof

The invention provides a polyglycolic acid composition as well as a preparation method and application thereof, and provides a new solution to improve the thermal stability and melt strength of a polyglycolic acid material, so that the processing thermal stability of polyglycolic acid is favorably improved; the material prepared on the basis of the polyglycolic acid composition is particularly suitable for being applied to degradable materials and barrier packaging materials. The polyglycolic acid composition comprises the following blended components in parts by mass: 100 parts of polyglycolic acid; 0.05 to 2 parts, preferably 0.2 to 1 part, of a hindered amine light stabilizer; 0.03 to 3 parts of an antioxidant; wherein the antioxidant comprises at least one of a hindered phenol antioxidant and a hydroxylamine antioxidant, and preferably, the antioxidant further comprises a phosphite ester antioxidant; the ratio of the total mass of the antioxidant to the mass of the hindered amine light stabilizer is 1: (1