The invention discloses an alternating current charging pile control system. The alternating current charging pile control system comprises a main controller, a communication managing module, a billing module and an automatic protection module. The communication managing module comprises a DGUS screen, a loudspeaker, a printer, a charging state indicator and an output socket. The billing module comprises a managing host, an IC card reader-writer, an IC card, an antenna and a multifunctional power meter. The automatic protection module comprises a one-way electric leakage protector, an anti-thunder, a safety relay, an alternating current contactor and a sudden stop switch. According to the alternating current charging pile control system, user account information is stored into the main controller and monitored and updated in real time, a user can pull up a cable at any time in the charging process, charging is automatically quitted, and flexibility is improved; three-level redundancy is designed, accurate coefficients of fault detecting and fault protecting are increased, and misfunction and no-action caused by device aging, the weather and the like are avoided; a networking billing unit and a stand-alone billing unit are arranged, information such as the user account balance can be temporarily stored under the situation of networking failures or power grid failures, and the billing accuracy and safety are guaranteed.