The invention provides a current loop communication device and an air conditioner. The air conditioner comprises an outdoor machine and at least one indoor machine. The current loop communication device comprises an indoor machine communication circuit and an outdoor machine communication circuit, wherein the indoor machine communication circuit is arranged in each of the at least indoor machine; the outdoor machine communication circuit is arranged in the outdoor machine; and the indoor machine communication circuit in each indoor machine is connected to a first alternating current power supply through a neutral wire and a live wire, the outdoor machine communication circuit is connected to a second alternating current power supply through a neutral wire and a live wire, the indoor machine communication circuit in each indoor machine is connected to the outdoor machine communication circuit through a signal communication loop, so as to realize the communication between each indoor machine and the outdoor machine. According to the technical scheme of the invention, the indoor machine and the outdoor machine can be electrified separately or through different phases, so that the requirements of the air conditioner on the capacity of power supply equipment are reduced, the wire diameter of single power supply wire can be reduced, the laying of power supply wires is benefited, and meanwhile, the relatively reliable communication between the indoor machine and the outdoor machine is guaranteed.