Large-scale pipe jacking local anti-drag grouting system

The invention discloses a large jacking pipe local resistance reduction grouting system which comprises a local jacking pipe joint friction resistance monitoring unit, an automatic grouting resistance reduction unit and a grouting control unit. The local jacking pipe joint frictional resistance monitoring unit comprises a plurality of strain gauges and a transmission assembly, and the plurality of strain gauges are pre-buried in each jacking pipe joint and are in data connection with the transmission assembly; the automatic grouting drag reduction unit comprises a mud pit, a grouting pipeline and a pipeline control assembly, and the grouting pipeline communicates with the mud pit and is distributed to each jacking pipe joint along the jacking pipe tunnel; the pipeline control assembly is arranged on the grouting pipeline; and the grouting control unit calculates and determines the frictional resistance borne by each pipe joint, and controls a pipeline control assembly in the automatic grouting resistance redu