An air-cooled split-type air conditioner connection system, aiming at the problems of large resistance and poor oil return in the pipeline when the air conditioner is installed over a long distance and with a high drop, the invention provides an air conditioner connection system, its The exhaust rising pipeline (4) is a consistent upward pipeline, and an oil separator (5) is installed at the lower end of the exhaust rising pipeline (4), and the exhaust inlet (5-1) of the oil separator (5) It is connected with the exhaust horizontal pipeline (3) coming out of the indoor unit (1), and the exhaust outlet (5-2) of the oil separator 5 is connected with the exhaust rising pipeline (4) going to the outdoor unit (2); The oil return pipe interface (5-3) of the oil separator (5) is connected to one end of the oil return line (6), and the other end of the oil return line (6) is connected to the compressor (1-1) in the indoor unit (1) on the air return line (1-2). The invention has the advantages of small resistance, smooth oil return, simple system structure, easy implementation, easy installation, low cost, low initial investment, low operation and management costs, less building space occupation, and low cost, which is beneficial to popularization and application.