Sealing device for devolatilization kettle and devolatilization reaction system

The utility model provides a sealing device for a devolatilization kettle and a devolatilization reaction system. The sealing device comprises a sealing seat, a shaft assembly, a framework oil seal group, a labyrinth sealing structure and a dry gas sealing structure. The shaft assembly comprises a stirring shaft rotationally arranged on the sealing seat and a shaft sleeve arranged outside the stirring shaft in a sleeving mode, and the first end of the stirring shaft and the first end of the shaft sleeve both extend into the devolatilization kettle. The framework oil seal set comprises a plurality of framework oil seal structures arranged outside the shaft sleeve in a sleeving mode. And the labyrinth seal structure is sleeved outside the shaft sleeve and is positioned on the part of the first end of the shaft sleeve, which is not provided with the framework oil seal group. The dry gas sealing structure comprises a gas inlet channel formed in the sealing seat, the gas outlet end of the gas inlet channel is comm