The present invention discloses a thermostable zinc metal organic framework material, a preparation method therefor and an application thereof, and relates to the field of polyglycollide catalysts. A catalyst in the invention is a thermostable zinc metal organic framework material with a chemical formula as follows: [Zn4(L)3[mu]4-O)] (H2O)0.25, wherein [mu]4 is an oxygen bridging, L is a 4, 4 '-((1H-1, 2, 4- triazolylazo-1-yl )methine) ibenzoate dicarboxyl anionic ligand. According to the thermostable zinc metal organic framework material, cheap and non-toxic zinc acetate dihydrate, the organic ligand 4, 4'-((1H-1, 2, 4- triazolylazo-1-yl )methine) dibenzoate and potassium hydroxide are adopted in water, and a material with a three-dimensional metal organic framework structure is obtained via a thermal reaction under a closed condition. The synthesis method disclosed by the present invention is high in yield, and good in reproducibility; An obtained crystal is high in purity, and good in thermal stability. The zinc metal organic framework material has good catalytic activity to loop-opening of glycolide; and the weight average molecular weight of prepared polyglycollide exceeds 0.15 million, and the prepared polyglycollide can be used in the field of medical polymer materials.