The invention relates to the technical field of pontoon bridge construction, in particular to a precision control process of hinge on-site high-precision boring. The process comprises the following steps of S1, controlling the precision of the opening size of a hinge eye plate, S2, controlling the precision of the axis reference line of the hinge eye plate, S3, carrying out boring machining and controlling the boring machining precision, and S4, carrying out boring precision inspection. The problems that the installation precision of the hinge eye plate is difficult to control and the boring precision requirement is difficult to meet in the construction of the French pontoon bridge are solved, and meanwhile marking deviation, machining deviation and deformation caused by temperature difference in the machining process, which are likely to occur in the axis line marking process, the boring machining process and the hinge eye plate shaft hole finishing inspection process are eliminated,so that the French pontoon bridge on-site boring process achieves the purposes of high precision, high quality, high efficiency and cost reduction.