The invention relates to an elevated sound barrier for rail traffic. The elevated sound barrier comprises sound barrier units, and in the direction from an inlet end to a middle segment, the area of awind receiving surface of the sound barrier unit at the inlet end is gradually increased; in the direction from an outlet end to the middle segment, the area of a wind receiving surface of the soundbarrier unit at the outlet end is gradually increased. According to the elevated sound barrier for rail traffic, height gradual-change structure design is adopted for charging the area of the wind receiving surfaces of a sound barrier body, when a train enters or leaves, the application force of air pressure waves to the sound barrier is gradually changed, and accordingly the application force ofthe air pressure waves generated by the train is gradually increased or decreased. The application force of the air pressure waves to the sound barrier is gradually increased or decreased so as to avoid the destructive influence of impact generated by instant air pressure change on the sound barrier, and the impact of instant air pressure change of the train on the train is also reduced. Accordingto the elevated sound barrier for rail traffic, the impact influence caused by instant change of air pressure when the train passes is reduced, the safety of the sound barrier is improved, and the driving conditions of the train are also improved.