Six-kettle polymerization device

The invention provides a six-kettle polymerization device, and belongs to the technical field of fixed reactors suitable for physics or chemistry. The device comprises a primary esterification kettle,a secondary esterification kettle, a primary polycondensation kettle, a secondary polycondensation kettle, a tertiary polycondensation kettle and a final polycondensation kettle which are sequentially arranged, a feeding pipe is arranged at the top of the primary esterification kettle, a sleeve is arranged in the primary esterification kettle, and a through hole is formed in the sleeve; the secondary esterification kettle consists of an esterification outer chamber and an esterification inner chamber; wherein a barrel is arranged in the primary polycondensation kettle and divides the primarypolycondensation kettle into a polycondensation outer chamber and a polycondensation inner chamber which are communicated with each other; the final polycondensation kettle is composed of a squirrel-cage stirrer, a plurality o