The invention relates to the technical field of penetrating-binding machines, and discloses a steel strand penetrating-binding device. The steel strand penetrating-binding device comprises a base, a motor is fixedly installed on the outer surface of the upper end of the base, and a transmission chamber is arranged at one end of the motor and arranged on the outer surface of the upper end of the base. A strand outlet is formed in one end of the transmission chamber, a separating device is arranged on the side, close to the strand outlet, of the transmission chamber, and the separating device isarranged on the outer surface of the upper end of the base. An additionally-installation device is arranged on one side of the separating device and arranged on the outer surface of the upper end ofthe base. Four sets of fixing buckles are arranged on one side of the base. According to the steel strand penetrating-binding device, the steel strand can be cut through the separating device, the base can be fixed with the fixing buckles, the assembly convenience of the steel strand penetrating-binding device is improved, guide caps can be semi-automatically and additionally installed, the abrasion of steel strand to the strand outlet in the penetrating-binding process can be reduced, and the service life of the device is prolonged.