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This invention relates to the field of grounding angle steel construction technology and provides a construction device for grounding angle steel of roadbed contact network foundation. The device includes a telescopic base frame, with main trusses fixedly connected to the four corners of the upper surface of the telescopic base frame. Folding ground anchors are symmetrically hinged to both sides of the telescopic base frame. A telescopic top frame is fixedly connected to the top of the main truss. A horizontal positioning device is fixedly installed on all four sides of the telescopic top frame. Folding handles are symmetrically hinged to both sides of the telescopic top frame. A protective net is installed at the bottom of the telescopic top frame. Guide components are installed inside both the telescopic base frame and the telescopic top frame. This construction device for grounding angle steel of roadbed contact network foundation can automatically drive the grounding angle steel by striking it with a hammer and buffer pad as the hollow tube moves downwards. This reduces the problem of unsatisfactory angle and depth when manually driving the grounding angle steel, improves the construction efficiency, and ensures the quality after construction.