The present invention discloses a method for controlling longitudinal restraint and displacement of a long-span continuous steel trussed cable-stayed bridge; in the present invention, a restraint limit rod is in hinged connection with supporting seats on two ends of the limit rod to achieve the purpose of longitudinal spacing; and the end of the restraint limit rod is released, and a jack is usedto push the restraint limit rod, so as to longitudinally displace the bridge. By using the method, longitudinal restraint limit, closure status adjustment, and conversion of a closed bridge system canbe simultaneously completed in the construction process of the continuous steel trussed cable-stayed bridge. The continuous steel trussed cable-stayed bridge has the advantages of simple structure, convenience to manufacture, good applicability, and simple operation, thereby effectively solving the technical problem in the process of erecting and closing the cantilever of the long-span continuoussteel trussed cable-stayed bridge.