A fast connector pull-to-penetrate device includes a pull-through and penetration device that includes two flexible extension arms, each having a free end formed with a through aperture. A cap is formed with a coupling opening in each of two opposite sides thereof. The pull-through and penetration device is selectively fit to a transmission cable at an end of a connector and the cap is attached to the connector and fit to a signal terminal of the connector, such that the extension arms are respectively received through the coupling openings of the cap to have the through apertures moved past the two coupling openings and located frontward of the cap. A rope is tied to the through apertures of the extension arms to allow the pull-through and penetration device, to be moved through a number of installation holes through pulling of the rope.