The invention relates to a railway passenger carriage body protective cover, which comprises two sets of split-type protective covers, each set of protective covers has several cover doors of rigid structure which are nested in sequence, a roller is installed at the bottom of the cover door, the car body is provided with a track corresponding to each cover door, and the roller is installed on thetrack to realize the cover door to move along the track; The inner wall of the cover door is provided with a guide wheel for abutting against the outer wall of the adjacent inner cover door, the innerwall of the innermost cover door is provided with a guide wheel for abutting against the side wall, the vehicle bodies on both sides of the protective cover are provided with quick clamps for fixingthe outermost cover door, and rubber stops are arranged between the adjacent cover doors and between the end cover door and the vehicle body. The cover door of the railway passenger carriage body protective cover adopts a rigid structure, and after the protective cover is closed, the cover door can form an integral body with the vehicle body in appearance and is beautiful in appearance; The coverdoor of rigid structure has high stability, can be designed to open and close automatically, and has good sealing property. The guide wheels between the guide wheel housing doors ensure the stabilityof the individual housing doors during movement, ensuring uniform clearance between each layer even if the door is aged at a later stage.