Flexible pier-side girder erecting platform and construction method thereof

The invention discloses a flexible pier-side girder erecting platform and a construction method thereof, and relates to the field of bridge construction. The platform comprises a steel box girder platform which is arranged on the outer side of a main tower cross beam; the main tower cross beam is positioned between a first tower column and a second tower column which are opposite to each other; a first cable-stay system is arranged between the steel box girder platform and the first tower column; one end of the first cable-stay system is connected with the steel box girder platform; the other end of the first cable-stay system is connected with the first tower column; a second cable-stay system is arranged between the steel box girder platform and the second tower column; one end of the second cable-stay system is connected with the steel box girder platform; the other end of the second cable-stay system is connected with the second tower column. A longitudinal locking device is arranged between the steel box girder platform and each of the first tower column and the second tower column. The flexible pier-side girder erecting platform is not restricted by terrain conditions; the construction difficulty is relatively low; moreover, the cost can be reduced.