The invention discloses a wire bending device. The wire bending device comprises a box body, a wire passing board and a baffle, wherein the wire passing board is rotationally arranged at the upper endof the box body, the baffle is fixedly arranged at the upper end of the box body, a wire passing hole is formed in the wire passing board, a first rotating shaft is rotationally arranged at the upperend of the box body through a bearing, the wire penetrating board is fixed to a first rotating shaft through a first connecting rod and a second connecting rod, the other end of the first connectingrod is connected with the first rotating shaft and then extends into the box body, a motor is arranged in the box body, the motor drives the first connecting rod to swing around the first rotating shaft, a circular arc-shaped guide rod is fixedly arranged at the inner end part of the box body, a semicircular guide rail is arranged on the arc-shaped guide rod, a swing rod is arranged on one side ofthe arc-shaped guide rod, the swing rod is fixedly arranged on a second rotating shaft, the second rotating shaft is rotationally arranged inside the box body through a bearing, a roller is arrangedat the free end of the swing rod, and the roller is arranged in the guide rail of the arc-shaped guide rod in a sliding mode. According to the wire bending device, the bending speed of a wire is increased, and the construction speed is accelerated.