The invention relates to a distribution automatic device, and especially relates to a distribution current transformer secondary cable insulating strength index prediction device. The distribution current transformer secondary cable insulating strength index prediction device is structurally characterized in that a signal acquisition module installed on a distribution current transformer is formed by a primary current transformer, a secondary current transformer, a primary voltage transformer, a secondary voltage transformer and a transformer temperature sensor; output terminals of the primary current transformer, the secondary current transformer, the primary voltage transformer, the secondary voltage transformer and the transformer temperature sensor are connected with input terminals of a 5G14433 A/D converter; an output terminal of the 5G14433 A/D converter is connected with an input terminal of a CPU central processing unit; and serial ports of the CPU central processing unit are connected with input terminals of a liquid crystal display module and a Bluetooth communication transmission module. The distribution current transformer secondary cable insulating strength index prediction device is high in prediction accuracy and high in data acquisition and processing efficiency, and safe operation of the distribution current transformer can be effectively guaranteed.