Polyester yarn drying device with high safety performance

The invention relates to a polyester yarn drying device with high safety performance, which comprises a drying box body, a guide roller assembly, a clamping assembly and a controller, a feeding roller or a discharging roller is provided with a tension sensor for sensing whether polyester yarn is broken or not, and the clamping assembly comprises a plurality of automatic clamping pieces; the automatic clamping piece is arranged on the side, wound by polyester silk, of the guide roller and driven by the driving assembly to move close to or away from the guide roller, the controller is used for receiving a signal transmitted by the tension sensor, and when the tension sensor transmits a polyester silk breakage signal, the controller controls the driving assembly to drive the automatic clamping piece to move in the direction close to the guide roller. The automatic clamping piece is matched with the guide roller to clamp the polyester silk; through mutual cooperation of the tension sensor, the controller, the gui