The folding underground detectable warning tape is made of polyethylene or polypropylene as the main component of the warp and weft threads, and then double-sided lamination. It has the characteristics of acid resistance, alkali resistance, and corrosion resistance. The warning tape is buried above the pipelines. When it excavated by equipment, its foldable structure can not be cut off and can hook the bucket, then automatically unfolds and hangs in the air to achieve the effect of warning and avoiding damage to the pipelines.