The invention provides a broken yarn protection system of a warp knitting machine, and belongs to the technical field of spinning. The broken yarn protection system of the warp knitting machine solves the problems that yarn in an existing warp knitting machine is easy to break, and therefore machine faults can easily happen in a following mode. According to the broken yarn protection system of the warp knitting machine, the warp knitting machine comprises a machine frame and a yarn-feeding rolling barrel arranged on the machine frame, and the yarn-feeding rolling barrel is driven to rotate by a drive motor. The broken yarn protection system comprises an air outlet pipe, an infrared emitter and an infrared receiver, wherein the air outlet pipe is fixed to the machine frame and is parallel to the yarn-feeding rolling barrel, the infrared emitter is fixed to one end of the machine frame, the infrared receiver is fixed to the other end of the machine frame, the infrared emitter faces the infrared receiver, an inducing straight line is located on one side of yarn, the air outlet pipe is located on the other corresponding side of the yarn, and a plurality of air outlet holes facing the yarn are formed in the pipe body of the air outlet pipe. According to the broken yarn protection system of the warp knitting machine, when yarn is broken in the operating process, the drive motor can be automatically controlled to stop working so as to remind working personnel to replace the yarn, and accordingly machine faults are avoided.