The utility model provides a transformer substation storage cell state monitoring system, it includes battery, signal processing unit and control center, accumulator output and signal processing unit are connected, signal processing unit output is connected with control center, signal processing unit includes that host system reaches rather than the internal resistance detection module who is connected, internal resistance detection module includes intelligent load unit and peak detection circuit, intelligence load unit be in the positive and negative both ends of battery, intelligence load unit control termination host system, the accumulator output signal is through signal filtering amplification unit and peak detection circuit input connection, peak detection circuit output is connected with host system through a AD converting circuit. Adopt the technical scheme of the utility model on line measurement storage battery internal resistance 's under the strong jamming environment measurement accuracy has been improved.