The utility model provides a highway noise monitoring system, this system includes thermoscope and hygronom, utilize hygronom and thermoscope to monitor the temperature and humidity of monitoring point environment, so that subsequent analytical work provides accurate environmental information, and the copy control device is automatic to the noise meter, the vehicle flowrate calculating instrument,horizontal distancer, the GPS locater, perpendicular distancer, the process line and the operating time of thermoscope and hygronom control, monitoring data to it takes notes and saves, guarantee theaccuracy and the standardization of data, and can use in a plurality of monitoring points simultaneously, need not to consume a large amount of labours.