The utility model discloses a two function moving top cover of slip integral type rotate, including lower floor's top cap, upper top cap, the top cap transmission of lower floor and upper top cap drive arrangement, the top cap transmission of lower floor fixes at the headwall top, the top cap transmission of lower floor and the header connection of lower floor remove lower floor's top cap through the top cap transmission of lower floor, make the hopper car roof constitute that the charging hole is opened or the lid closes be provided with a plurality of charging holes along the automobile body direction on lower floor's top cap, upper strata top cap slidable ground sets up on lower floor's top cap, upper strata top cap drive arrangement and upper header connection, through the upper top cap of upper top cap drive arrangement removal, the charging hole on the messenger lower floor top cap is opened or is covered and closes. The utility model discloses an upper and lower layer top cap complex mode, upper and lower layer top cap has different usage respectively, and the shipment function that makes same railway freight car can realize large granule and dust particle goods simultaneously has good commonality, improves the vehicle utilization ratio, accords with the market diversification requirement.