The invention discloses a simplified design method for a continuously-welded rail of a ballastless track of an ultra-large bridge of a railway. The method comprises the steps of: S1, utilizing ANSYS software to perform analog simulation on the continuously-welded rail structure on the ultra-large bridge; S2, establishing a horizontal and vertical space coupling static model for the continuously-welded rail of the ballastless track of the ultra-large bridge of the railway, wherein modeling objects include a steel rail, a fastener, a track board, an elastic rubber pad layer, a limiting boss, a bridge and a pier; and S3, performing static analysis on the coupling static model. According to the technical scheme, on the basis of the simplified design method, static force of a continuously-welded rail-ballastless track-ultra-large bridge system of the railway can be accurately and effectively analyzed, relation of interaction between girders and rails is fully considered, modeling of the track structure is finished according to an actual state as far as possible, a computing model is simplified on the premise of ensuring the model to be fine, complete and accurate, and remarkable improvements are achieved in design in comparison with a conventional modeling method.