Warning isolation device for construction site

The utility model discloses a construction site warning isolation device, and relates to the field of guardrails, the construction site warning isolation device comprises two symmetrically arranged supporting columns, a connecting rod is connected between the two supporting columns, and the adjacent guardrails are detachably connected through an adjusting structure; the adjusting structure comprises a fixing rod, a first oval groove, a cylinder, a convex body, a fixing bolt, a first circular groove, a second circular groove and a second oval groove, and the fixing rod is rotationally connected with one end of one supporting column through the fixing bolt; and the first elliptical groove and the first circular groove are formed in the fixing rod. By arranging the fixing rod provided with the first oval groove, the first circular groove, the second oval groove and the second circular groove, the guardrail can be fixed when being stored and can be mutually fixed when a plurality of guardrails are combined for us