The utility model discloses a locomotive skylight structure, the sensor comprises a connection base, set up the bolt hole on the connecting seat, the bolt passes the bolt hole is fixed with the locomotive top, skylight base one side is fixed with the connecting seat through folding paper, sets up locking slide between other one side of skylight base and connecting seat, set up the kuppe on the base of skylight, the both ends of kuppe set up the air door. The utility model has the advantages that: because the both ends of kuppe have all set up the air door, when the locomotive goes, go the air door of orientation towards the locomotive and close, the air door of one side is opened in addition, like this, forms the less region of relative wind pressure in one side skylight that the air door was opened, and gas in the locomotive flows to this atmospheric pressure less position, and the completion is taken a breath, the hydraulic pressure bracing piece air damper of accessible hydraulic system control opens size and then control ventilation volume, in addition, owing to set up the kuppe structure that does benefit to gas flow, consequently, the noise is less.