An automatic rock wool yarn feeder, comprising a support structure made of a post and a square tube, the top of the square tube having a guide rail parallel to its side, with a slider fitted inside the guide rail, a sliding platform mounted on the slider's top, a伺服motor installed on the sliding platform's top via a reducer, a drag chain connected to the sliding platform's side, the servo motor connected to the drag chain via a belt drive, a connecting column with a gripper mechanism attached at its bottom, the gripper mechanism including a connecting strip and side panels, the side panels having a connecting shaft installed with bearings inside, with hooks mounted on the connecting shaft, a hopper located below the post, an electric control box on the post side, a transfer plate with a middle slot connected to the sliding platform, a square pipe for connection fitted inside the transfer plate, the square pipe having a rack on its side, a servo motor mounted on the transfer plate with a gear on its shaft meshing with the rack, a guide rail with a slider fitted on its side on the opposite side of the square pipe, a drag chain bracket installed on the transfer plate's top with a drag chain on top of it, and the drag chain connected to the square pipe via a collision prevention plate.