The invention discloses an anti-disengagement lamp for a railway vehicle. The lamp comprises a lampshade and a lampshade frame. The lampshade frame is arranged around the lampshade. The joint between the lampshade and the lampshade frame is bent upwards to form a bent portion. The bent portion is hasped to the top of the lampshade frame. By means of the hasped structure of the lampshade and the lampshade frame, the lampshade is prevented from being disengaged, and the problem that a lampshade fastener is exposed outwards in the prior art is solved.