Accurate positioning method of sliding of full-support frame steel box girder

The invention relates to an accurate positioning method of the sliding of a full-support frame steel box girder, comprising the following steps of: firstly setting up a steel box girder installation full-support frame, wherein the upper part of the full-support frame is provided with a sliding chute, and a shifter is placed on the sliding chute; then placing the steel box girder on the shifter of the full-support frame by a large-sized floating crane, and towing the steel box girder to longitudinally move to a specified position along the sliding chute; horizontally pushing the shifter by a jack so that the steel box girder horizontally moves to a set position; and finally vertically regulating the steel box girder by the jack so that the accurate positioning and installation of the steel box girder is realized.