The invention belongs to an integral reactor pile top structure, and particularly relates to a turnover pile top cable bridge fixed on a civil engineering platform. A supporting seat is anchored in the civil engineering platform; one end of the cable bridge is movably connected with the supporting seat, and a turnover angle is larger than or equal to 90 degrees; a support frame is arranged above the cable bridge, and is formed by a framework structure and a pull rod; one side of the framework structure is connected with the upper part of the cable bridge; the other side of the framework structure is connected with the pull rod; a fixed seat is anchored in the civil engineering platform, and is located on the outer side of the supporting seat; two support legs are arranged on the other end of the cable bridge; a cable connecting plate is arranged above the reactor pile top structure; when the cable bridge is put horizontally, the support legs are supported above the reactor pile top structure; when the cable bridge is turned over to a vertical position, the pull rod is connected with the fixed seat. According to the integral reactor pile top structure, the axial dimension and the radial dimension of the pile top structure are reduced, the operation steps and the operation time of the pile top structure are reduced, and the economical efficiency and the safety of the reaction pile are improved.