The utility model discloses a locking device of container, including locking lever, lock body, retaining ring and handle, the locking lever comprises tapered end portion and locking lever portion, the lock body is provided with central perforating hole along its axial, the central perforating hole of lock body passes in the locking lever portion of locking lever, the tapered end portion of locking lever is located the up end at the lock body, the retaining ring setting is cup jointed in locking lever portion in lock body below and fixed, handle and locking lever troops under one's command end connection drive the rotation of locking lever through turning handle. Through inciting somebody to action the utility model discloses the setting is on the chassis of containerized traffic flatcar, and easy operation is loaded and unloaded moreover in the reliability and the security that can improve whole car behind the container loading greatly, can improve the handling efficiency of container simultaneously by a wide margin.