The invention discloses a method for evaluating the aging degree of a basin-type insulator. The method comprises the following steps: sample selecting: selecting un-aged insulators, insulators runningfor one year and insulators running for five years, selecting three samples from the three types of basin-type insulators respectively; sample pretreating: washing and drying the three samples respectively; thermal weight loss-differential thermal analysis: using a thermal weight loss-differential thermal comprehensive thermal analyzer to carry out thermal weight loss-differential thermal analysis on the three pretreated samples respectively to obtain a TG-DTA curve. Activation energy calculating: according to the TG-DTA curve, using an Ozawa method to calculate the activation energy of the three samples based on the Arrhenius equation; comparing and analyzing: plotting the activation energy curves of the three samples and carrying out comparison and analysis to evaluate the aging degreeof the basin-type insulators. According to the embodiment of the invention, the aging degree of the basin-type insulators can be directly reflected, and the aging degree of the basin-type insulators can be accurately and reliably evaluated.