The invention relates to a cascaded battery management system. The cascaded battery management system comprises a cascaded signal acquisition balanced protection circuit, a voltage and temperature processing circuit, a current acquisition circuit and a data processing and communication circuit, wherein the cascaded signal acquisition balanced protection circuit is used for respectively acquiring a voltage signal of each battery of a battery pack to the voltage and temperature processing circuit, the data processing and communication circuit is used for respectively acquiring a voltage/temperature signal, processed by the voltage and temperature processing circuit, of each monomer battery and current information, acquired by the current acquisition circuit, of a battery loop during charging and discharging so as to achieve charge state estimation of the battery, voltage balance of each monomer battery and protection on overtempeature, low temperature, undervoltage, overvoltage, overcharging, over-discharging and the like, and meanwhile, the battery information is interacted with a vehicle-mounted center control system through the data processing and communication circuit.