The invention provides a DC bushing condition evaluation method based on an Apriori algorithm, which comprises the following steps: according to the operation stage of the DC bushing, collecting the characteristic quantity data corresponding to the DC bushing and preprocessing the characteristic quantity data; determining DC bushing state information corresponding to the characteristic data of theDC bushing after the pretreatment according to a predetermined DC bushing state evaluation model, wherein the DC bushing state evaluation model is determined according to the DC bushing defect faulthistory data based on an Apriori algorithm. According to the operation data of the converter valve side sleeve and the DC through-wall sleeve, the status of the bushing is evaluated to determine the possible failure modes of the bushing at the present operating stage, so as to warn or predict the possible failure in advance.