Temporary movable guardrail at upper part of subsea tunnel steel shell immersed tube

The utility model provides a temporary movable guardrail on the upper portion of a steel shell immersed tube of a subsea tunnel. The device comprises a plurality of bases and guardrails mounted on thebases, wherein the base is provided with a shell; a permanent magnet lifting jack is arranged in the shell; a preformed hole is formed in the shell, and a switch handle of the permanent magnet jack extends out of the shell through the preformed hole. Guardrail installation connectors are further pre-arranged at the top of the shell, the guardrail comprises vertical rods and transverse rods, the vertical rods are supported and fixed to the top of the base through the guardrail installation connectors, the transverse rods are erected and fixed to the adjacent vertical rods, and the base is attracted and fixed to the top of the steel shell immersed tube of the subsea tunnel through magnetic attraction force of the permanent magnet jack. The guardrail is convenient to disassemble and move, issuitable for safety prote