A esterification polymerization reactor consists of a reaction vessel, agitator and drive system, cooling device, explosion-proof device, heating furnace, etc.。An esterification-polycondensation reactor is a reaction vessel that completes esterification and polycondensation simultaneously. When conducting esterification reactions in the reactor, water and low-molecular-weight substances produced during the esterification are separated using a rectification column, packed tower, and condenser. When performing polycondensation reactions in the reactor, the esterification valve is closed, and the polycondensation valve is opened. The temperature is adjusted to a higher level, and through the agitation system, many identical or different low-molecular-weight substances interact to form high-molecular-weight substances. Simultaneously, the precipitated low-molecular-weight substances are collected and separated using a condenser receiver. The esterification-polycondensation reactor is widely used in organic synthesis, chemical fibers, and other fields.