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This utility model discloses a highway slope displacement monitoring and early warning device, relating to the field of slope monitoring technology. It includes: a base, anchored to a stable slope on one side of a crack via a first fixing column; a fixing block, anchored to the other side of the crack via a second fixing column; an arc-shaped sensing rod, with its two ends connected to the base and the fixing block respectively, and its middle section bent away from the slope; the arc-shaped sensing rod is hollow inside, and contains several elastic deformation force sensors arranged sequentially along its length; and it also has a visual warning unit. Using this solution, the device can receive and transmit data on changes in local stress based on the displacement of the arc-shaped sensing rod's two ends. After data analysis and processing, the device is linked to the visual warning unit, quickly alerting pedestrians or vehicles while also facilitating the location of monitoring points for professionals.