The invention relates to a high-alcoholysis-degree polyvinyl alcohol resin re-saponification testing device which is characterized by being provided with a testing reaction kettle consisting of a cylinder body and an upper flange end cover, wherein the cylinder body is of a jacket structure, a cooling water cooling mode is realized through a jacket, a stirring device is arranged in the reaction kettle, and a main motor used for driving a stirring shaft is a variable frequency motor, and the cylinder body and the upper flange end cover of the reaction kettle are respectively provided with an inlet and an outlet and are provided with various display instruments. The high-alcoholysis-degree polyvinyl alcohol resin re-saponification testing device takes the reaction condition requirement of polyvinyl alcohol resin re-saponification into consideration, has functions of pressure resisting, sealing, stirring, cooling, cold insulating, pressurizing and the like, is used for detecting temperature, pressure and the like, and realizes a process condition of a re-saponification test.