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The utility model provides a kind of formwork device and angle steel tower protective cap construction device.The formwork device includes hoop, limiting post, frame and adjusting rod, the limiting post is vertically connected on the hoop, at least a group is diagonally provided on the hoop, the frame is clamped between at least one hoop, the frame is formed with formwork cavity, the adjusting rod is arranged along the periphery of the formwork cavity, and the adjusting rod is connected with the frame and can be telescopic to the formwork cavity.The utility model can effectively limit the formwork, to ensure that the protective cap poured meets the design requirements, does not affect the connection stability of tower foot and foundation, and can effectively protect the tower foot and foundation, improve construction quality.