Rail transit signal cable with integrated shielding function

The invention discloses a rail transit signal cable with an integrated shielding function. The outer surface of stranded single wires is provided with an inner insulation layer. A coating layer coats the outer surfaces of 2 to 20 conductive wires. A first copper layer coats the outer surface of the inner insulation layer. A steel layer coats the outer surface of the first copper layer. A second copper layer coats the outer surface of the steel layer. The first copper layer and the inner surface of the steel layer are connected through a first alloy layer in a sealing way, and the second copper layer and the outer surface of the steel layer are connected through a second alloy layer in a sealing way. An outer sheath layer coats the outer surface of the second copper layer. The first alloy layer is formed by 74% of copper, 19% of iron, 4% of molybdenum, 2.2% of chromium and 0.8% of carbon, and the second alloy layer is formed by 25% to 35% of copper, 60% to 70% of iron, 3% to 5% of molybdenum, 2% to 3% of chromium, and 0.8% to 1% of carbon. According to the rail transit signal cable with an integrated shielding function, the shielding performance and corrosion resistance performance are improved, the transmission attenuation of the cable is reduced, and the adhesion and resistance to mechanical force are improved.