The utility model discloses a nailing device for new nail gun, comprising a nail loading box, a nail outlet and a nailing port arranged at the front end of the nail loading box, a nailing plate arranged above the nailing port; wherein, a nail retaining reed is arranged on the lateral face at the lower end of the nailing plate which is above the nailing port; when being used, the nail at the foremost end of the nail loading box is pressed by the lower end of the nail retaining reed. The utility model can beat the same nail once again without packing up the nail gun, until the nail is planished and meets the qualification.