The invention provides a power transformer state evaluation method and system based on electriferous detection. The method comprises the steps that real-time state quantity data of a transformer to be evaluated are obtained; an established evaluation model is used for evaluating the real-time quantity data to obtain a state evaluation result of the transformer to be evaluated, wherein the evaluation model is established according to the initial state quantity of the transformer to be evaluated. According to the evaluation method, the evaluation model which is established in advance is used for accurately reflecting features and attributes of the transformer, the transformer can be overhauled according to the obtained state evaluation result in a targeted mode, preventive measures are taken, thus, the problems that in the prior art, manpower and material resources are wasted and operation and the available rate of a transformer are affected due to the fact that schedule maintenance and corrective maintenance are conducted on the power transformer are solved; moreover, the evaluation process is visual, simple and easy to grasp, and high practicability is achieved.