A wire tension detecting and monitoring system on a production line is provided, which belongs to a spinning equipment, in particular to being suitable for online detecting the quality of filament yarn. The invention aims at overcoming defects of manually checking of the silk quality and automatically detecting the dyeing capacity of silk; in addition, the invention aims at detecting whether the silk is under normal working state and real-timely and effectively controlling to improve the rate of finished product of silk. The silk signal is detected through fiber tension on the production line,and then the quality index of silk can be obtained after the system automatic analyzing and processing. The invention is characterized by a tension detecting system and a silk cutting mechanism; thetension detecting system comprises a tension detecting probe, a SCM and a controlled channel switcher and an A/D converter; the signal data output by the tension detecting probe is transferred to thechannel switcher, the signal of the channel switcher enters the A/D converter, the A/D converter is connected with the SCM, the SCM is connected with the micro computer through serial port. By checking tension information of silk automatically during the production process, the invention realizes real-time and rapid reflection of silk quality, effectively controls the production quality of silk, greatly shortens detection time and silk reject rate and improves silk yield.