The utility model relates to a guardrail for an ocean platform. The guardrail comprises two vertical straight rods, wherein the two straight rods are connected through at least one cross rod, the tops of the two straight rods are sleeved by a protective sleeve, and the upper surface of the protective sleeve takes the shape of an outwardly-convex arc. The guardrail has the advantages of low manufacture cost and simple structure, and can greatly reduce the waste of personnel and energy, improve the working efficiency, guarantee the quality, and ensure the personal safety of workers.