A new green air-conditioning system based on the traditional absorption air-conditioning system is proposed: the system adopts biomass waste and forms a medium cycle with capacitive deionization (CDI) technology. The key to the new system is the electrodes of CDI. In our work, corn cobs, corn stalks, and waste cigarette butts have been used to prepare micro/mesoporous carbon material for electrode fabrication. The resultant material has been characterized by BET. The electrochemical performance has been tested with electrochemical workstation. The COP has been analyzed for the new air-conditioning system with different electrode materials. The results find the suitable conditions for preparing the electrode material with excellent pore structure and higher specific surface area. It has been demonstrated that the corn cobs activated at 800 °C (CBC-800) possess the highest specific surface area of 1201.9 m2 g-1 and the highest electrochemical capacitance of 141.1F g-1 at a scan rate of 5 mV s-1. The results show that the system with LiBr solution has the highest COP, it can approach 6 with a 40 % concentration when CBC-800 is used as carbon electrodes. These results could make the absorption air-conditioning system based on the capacitive deionization method more promising for future application.