The present disclosure illustrates a rope tail positioning fastener including a fastener body. The fastener body includes a base and an elastic arm, and the base has an insertion channel inside, and the insertion channel is provided with two through holes at a side thereof and a hole at other side thereof, and a stop part is formed between the two through holes, and a side of the base adjacent to the hole is bent to form the elastic arm suspended relative to the base, so that two tail parts of the rope can be inserted into, through and out of the insertion channel via the through holes; next, the two tail parts of the rope can be sewn to form a seam part; and, after the seam part is completed, the user can pull the rope back to receive the two tail parts inside the insertion channel.
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