Abstract: The "Internet + project management" model was adopted to study the informatization supervision of personnel, mechanical equipment, technical methods, environmental protection, safety and quality on the construction site. Two-dimensional code was scanned to quickly retrieve and query engineering data, technical regulations, etc. The face recognition and comparison techniques were used to check the legitimacy of the people entering and out of the tunnel, further check the safety of the personnel, training and education. The results show that the application of two-dimensional code in the intelligent construction site changes the traditional posting board in the site to information scanning and touch display. The amount of information can be raised by at least 10 times. Face recognition in tunnel mouth can improve the accuracy of identity verification of tunnel workers, basically eliminate human factors and improve the supervision of security and training.