An automobile air-conditioning system is provided, which includes an evaporator and an electrical expansion valve in communication via pipes, with the electrical expansion valve including a coil and a valve body, the coil being fixedly mounted on the valve body; the system also includes a support, the support including a heat-sinking bridge and a cooling ring, with the evaporator provided on one side of the heat-sinking bridge and the cooling ring provided on the other side of the heat-sinking bridge; the heat-sinking bridge and the cooling ring are formed in one piece or are connected with each other fixedly, and the coil is provided within the cooling ring. The automobile air-conditioning system has the advantages of a compact structural design, is capable of effectively cooling the electrical expansion valve, and has high system strength, stable transmission of coolant, and high security.