Metal guardrail capable of being quickly disassembled and assembled

The utility model discloses a metal guardrail capable of being quickly disassembled and assembled, and relates to the technical field of protective guardrails. The device comprises a plurality of vertical rods which are arranged side by side, and connecting transverse strips are arranged among the top ends of the vertical rods in a sleeved mode. The top end of the vertical rod is sleeved with a limiting bolt. The connecting transverse strips are fixedly connected with the vertical rods through limiting bolts; connecting rods are rotationally connected to the side faces of the bottom ends of the vertical rods. Spring bolts are arranged on the side surfaces of the bottom ends of the vertical rods; every two adjacent vertical rods are connected with the ends of the connecting rods in an inserted mode through spring cotters. The bottom end portions of the two vertical rods located at the two ends of the connecting transverse strip are in threaded connection with installation end sleeves. The two adjacent vertical