The invention discloses a construction site public opinion monitoring method based on finger vein data. Through deploying a finger vein data acquisition subsystem in the construction site, extracting data acquisition features, training data and building a user behavior model, one-time anomaly determination is carried out on the construction site public opinions. When an abnormal event happens, early warning is carried out timely through an information system, the defect that the existing prediction technology needs monitoring data is remedied, the real-time performance of early warning is improved, and a more timely response mechanism can be formed.