Linear positioning tool for bridge guardrail template

The utility model relates to the field of auxiliary tools for road and bridge construction, in particular to a linear positioning tool for a guardrail template. Comprising a supporting frame vertically arranged on a bridge floor, a scale is arranged on one side of the supporting frame, and the top line type of a guardrail formwork is controlled through the scale; the supporting frame comprises a vertical rod arranged in the vertical direction, the bottom of the vertical rod is supported on a control line of a bridge floor and fixedly connected with one end of a bottom plate, and the bottom plate is attached to the bridge floor. The top of the vertical rod is provided with a horizontally-arranged extension rod, the extension rod is perpendicular to a control line of the bridge floor, the end of the extension rod is provided with a ruler extending downwards, and the lower end of the ruler is aligned to the top of the guardrail formwork. The extension rod is supported through the supporting frame, the ruler is f