The invention relates to a multiloop charging method and system. According to the charging method, after a plurality of charging single bodies are ranked in sequence, the positive electrode output circuits and the negative electrode output circuits of the charging single bodies are arranged to form sequenced contacts according to the sequence of the charging single bodies, then, the output ends of the sequenced positive electrode circuits and the output ends of the sequenced negative electrode circuits are electrically connected through the sequenced contacts, all the sequenced contacts are connected with a detection loop through a signal cable at the corresponding positions of the contacts, and the detection loop is connected to an alternating-current power source and operates the working state of the alternating-current power source. The charging system further comprises a charging body, the detection loop, the alternating-current power source and a split-ranging series connection battery pack. The charging method is ingenious and reasonable in conception, and balanced, stable and efficient in charging and discharging, the potential problem of overcharge can be avoided, and the service life of rechargeable batteries can be prolonged. The charging system is simple and reasonable in structural design, balanced and stable in charging and discharging and applicable to application and popularization.