Synthetic fiber on-line production heating device

The utility model discloses a synthetic fiber on-line production heating device which comprises a horizontal heating tank, a heating roller arranged at the central axis position in the horizontal heating tank, a feeding hopper and a discharging pipe, spiral blades are arranged on the surface of the heating roller, and the heating roller comprises a rotating shaft, a shell arranged on the periphery of the rotating shaft in a surrounding mode and a hollow cavity located between the rotating shaft and the shell. A heating pipe is arranged in the hollow cavity, a quartz tube is arranged outside the heating pipe, an infrared radiation emitter is arranged in the quartz tube, a heating roller and a spiral blade form a spiral horizontal conveying mechanism, a feeding hopper is located at the front end of the conveying direction, and a discharging pipe is located at the tail end of the conveying direction in the conveying direction of the heating roller; and the shell is hermetically connected with the head and tail e