The invention discloses a Beijing type guardrail gap safety protector which comprises a protecting rod, bolt holes, bolts and nuts, wherein the protecting rod is a rectangular pipe; the short edge on the lower surface of the rectangular pipe is empty and a door form is enclosed by other three surfaces; two bolt holes are arranged in the protecting rod; the bolts penetrate through the protecting rod from one surface and penetrate outside form the other surface and the other ends are connected with the nuts. The protecting rod with an opening in the lower surface is directly fastened to a vertical bar elbow of a Beijing type guardrail; the bolt holes are aligned at the vertical bar elbow of the Beijing type guardrail; the bolts are inserted into the corresponding bolt holes and one nut is tightened at other end of each bolt. A gap of the Beijing type guardrail is protected, a person cannot insert the neck into the Beijing type guardrail and the security of the Beijing type guardrail is ensured. The Beijing type guardrail gap safety protector is simple in structure, fast in installation and low in cost; the Beijing type guardrail can be safely used to the end of life; and the national finance fund is saved.