The invention aims at providing a power battery monitoring multi-protocol conversion control system and method to solve the problems in the prior art. A protocol conversion controller serves as an IEC61850 terminal to communicate with a storage battery monitoring platform through the IEC61850 communication protocol; a protocol conversion controller matches the communication protocol of a lower layer RMU device and communicates with an RMU device according to the matched protocol; the protocol conversion controller converts a control command of the storage battery monitoring platform into a format conforming to the control protocol of the lower layer RMU device, and controls the RMU device according to the converted control command; and the protocol conversion controller obtains storage battery data and alarm information according to the data requirements of a session with the storage battery monitoring platform, and sends the storage battery data and the alarm information to the storage battery monitoring platform. The power battery monitoring multi-protocol conversion control system and method have the beneficial effects of performing communication on the existing device service processing with the storage battery monitoring platform by using the same program interface, and being applicable to large-scale heterogeneous system networking.