The utility model provides a stake semitrailer with an upper guide rail and side curtains. The vehicle comprises a vehicle frame, a carriage arranged on the vehicle frame and side curtains arranged onthe two sides of the carriage. Upper edge beams are arranged on the two sides of the top of the carriage correspondingly. Wherein a longitudinal guide rail is arranged on each upper side beam, a plurality of pulleys are arranged on each longitudinal guide rail, the top of the side curtain is connected with the plurality of pulleys respectively, the side curtain can be folded or unfolded through the sliding of the plurality of pulleys, and the two ends of the side curtain are fixed at the head and the tail of the carriage respectively. The stake semitrailer with the upper guide rails and the side curtains has the advantages of being scientific in design, convenient to operate, capable of saving manpower and high in safety.