An air traffic system with upper railways and lower railways comprises train stations, supporting rods, railways, railway boxes, trains, a power supply system and a control system. The air traffic system with the upper railways and the lower railways is characterized in that the railways are divided into the upper railways and the lower railways, the upper railways are installed inside the railway boxes, the lower railways are installed on the supporting rods, the railway boxes are arranged in air between the two adjacent train stations by relying on the supporting rods, the railways are continuous curved railways, the supporting rods are connected with the railway boxes and the lower railways in a sliding mode, the trains are hanged below the upper railways and supported above the lower railways, the trains move along the railways by relying on the power supply system and the control system, and the change on the speed of the trains is achieved by utilizing the conversion between the potential energy and the kinetic energy, so that the trains are convenient to start and brake, and the purposes of energy conservation, consumption reduction and emission reduction are achieved. The air traffic system with the upper railways and the lower railways has the advantages that the air traffic system with the upper railways and the lower railways can be manufactured in low cost, short time and mass production, the going out efficiency of residents can be greatly improved, the going out cost can be lowered, and the problems of traffic congestion and environment pollution can be solved.