Polymer on-line viscosity monitoring device and method in carbon fiber precursor production

The invention relates to a polymer on-line viscosity monitoring device and method in carbon fiber precursor production, and solves the technical problem of inaccurate viscosity measurement caused by the existence of residual glue and gas in the existing device, the device is provided with a viscometer, and the viscometer is provided with a main shaft, a bearing, a probe, a temperature sensor and a driving measurement mechanism. A decentralized control system, a flushing device and a vacuum device are further arranged; the decentralized control system is connected with the viscometer and the vacuum device; the vacuum device comprises a stop valve and a vacuum pump; the vacuum device is arranged at the middle upper part of the viscometer; the flushing device is provided with a dimethyl sulfoxide flushing pump, a dimethyl sulfoxide flushing liquid inlet ball valve and a raw liquid discharging ball valve; the flushing device is used for cleaning the pipeline and the probe; the vacuum device is used for extracting