A biodegradable sealant includes: a polyethylene glycol derivative; a photoinitiator; and a solvent, wherein the content of the polyethylene glycol derivative is about 10-75 wt% in the biodegradable sealant. The polyethylene glycol derivative is obtained by a substitution reaction, and in the substitution reaction, the polyethylene glycol is modified with methacrylic anhydride.一種生物可分解的封合膠,包括:一聚乙二醇衍生物:一光起始劑:以及一溶劑,其中於該生物可分解的封合膠中,該聚乙二醇衍生物的含量為約10-75 wt%。而此聚乙二醇衍生物係藉由一取代反應所獲得,而於該取代反應中,將聚乙二醇以甲基丙烯酸酐進行修飾。