Ventilation structure

The embodiment of the invention provides a ventilation structure installed on the side portion of a train body. The ventilation structure comprises a cover plate and a blocking piece; a cover plate ventilation hole is formed in the cover plate; the blocking piece is arranged on the side, facing the train body, of the cover plate; the lower portion of the blocking piece and the cover plate are fixed below the cover plate ventilation hole in a sealed mode; the side portion of the blocking piece and the cover plate are fixed outside the side end of the cover plate ventilation hole in a sealed mode; and a blocking piece main body between the lower portion and side portion of the blocking piece is used for bearing liquid entering from the cover plate ventilation hole, so that the liquid is prevented from entering the side, away from the cover plate, of the blocking piece main body. With the ventilation structure provided by the embodiments of the invention adopted, the technical problem ofdamage to equipment in a