Extensible and detachable outer wall screw device

The utility model discloses a telescopic detachable outer wall screw device, which comprises a screw type telescopic nut and a concrete-in screw embedded part, the screw type telescopic nut comprises a second butterfly nut, two flat sides of the second butterfly nut are respectively provided with a second steel pipe, and the second steel pipe is provided with a first steel pipe and a second steel pipe. A first steel pipe is inserted into the second steel pipe, and the first steel pipe and the second steel pipe are connected together through a bolt; the upper ends of the two first steel pipes are both connected to one end of the screw rod, the other end of the screw rod is provided with an E-shaped clamp, the E-shaped clamp is used for clamping and fixing the steel pipes in the construction process, and the E-shaped clamp is fixed to the screw rod through a first butterfly nut; the concrete-entering screw embedded part comprises a ribbed steel bar with a hook and a twisted steel bar, and the ribbed steel bar i