In view of the huge central air-conditioning system, it is difficult to carry out remote control, sharing billing and other issues, this article is based on the embedded platform, using B/S architecture, design and implement a central air-conditioning control management system with sharing billing function. From the hardware interface design, software communication process analysis, to the improvement of the charging algorithm, the design idea of the system is elaborated. The system uses the B/S architecture, which reduces the complexity of deployment while satisfying the use of cross-platform equipment; With FPGA, while ensuring the communication rate, expand the accessible devices to 4096 units; Use SQLite database and improved charging algorithm to complete functions such as apportioned charging storage display. The actual operation shows that the remote control function of the system is efficient and stable, and the apportionment billing function is reasonable and accurate, which solves the problems faced by the current central air-conditioning management system.