The utility model discloses a retractable prevents bird faller, including telescopic link joint, telescopic link joint is by a plurality of connecting plates articulated forming in proper order, and articulated department installs and prevent bird acupuncture, and telescopic link joint is provided with four sets, the four sets of telescopic link joints each other articulated be netted, prevent that the bird faller still includes U -shaped mount and band steel board, a waist type slide opening has been offered respectively at the both ends of band steel board, and the both ends of U -shaped mount are passed behind the waist type slide opening articulatedly with the tip of a telescopic link joint respectively, and the tip of two set other telescopic link joints hinges the positive middle part at the band steel board simultaneously, it is provided with the external screw thread with the opposite one end of thorn point to prevent that the bird is needled, prevents the articulated portion of the detachable threaded connection of bird acupuncture at adjacent connecting plate. Telescopic link joint is and nettedly articulated interweaves into a holistic expansion network frame, can equip more to prevent that bird acupuncture and structural strength are very high, the U -shaped mount of different models can be installed by the adaptation to setting up of waist type slide opening, has expanded the whole installation environment who prevents the bird faller.