The invention discloses a long-span tray for a shelter of a station building, and belongs to cable trays. The long-span tray comprises a tray arranged below the shelter and extending along the longitudinal direction of the shelter, wherein the tray is composed of a plurality of channel type trays connected together; length of each channel type tray is the same as span of the shelter that is 9m-12m; preformed holes through which the channel type trays can pass are formed in a structural beam of the shelter; a joint of each two adjacent channel type trays is arranged in the corresponding preformed hole; a steel plate is used as a leveling support gasket for the bottom of each joint and two ends of the steel plate are exposed, and antiskid anchor bolts are added on two ends of the steel plate for fixedly connection to ensure stability; and each joint is also connected with a ground copper strap wire and shelter posts via a tray connection plate for ground connection. The long-span tray for the shelter of the station building provided by the invention is the long-span steel cable tray that is convenient to install, reliable in structure, excellent in stress performance, and greatly reduced in cost.