The invention discloses an intelligent management device for condition based maintenance of an electric transformer. The intelligent management device comprises a signal collecting circuit for running conditions of the electric transformer, a signal data calculating, judging and processing circuit, a communication circuit, and an intelligent management command center circuit for the condition based maintenance of the electric transformer, wherein the signal collecting circuit for the running conditions of the electric transformer is used for outputting the collected data of various types of signals to the signal data calculating, judging and processing unit, the output end of the signal data calculating, judging and processing circuit is connected with the communication circuit, and the communication circuit is connected with the intelligent management command center circuit for the condition based maintenance of the electric transformer. The intelligent management device has the advantages that the running technical data of the electric transformer can be monitored at any time, the abnormal conditions of the transformer and electric distribution devices, such as voltage, current and temperature, can be timely found, and the maintenance can be timely arranged according to the running states of the on-site equipment.