The invention provides a fusion method and a device for fault diagnosis results, wherein, the method comprises the following steps of: acquiring a plurality of fault diagnosis results obtained by a plurality of diagnosis methods; wherein each diagnosis method corresponds to a fault diagnosis result; the corresponding fault diagnosis results of each diagnosis method are transformed into individualmatching degree according to the individual matching degree matrix. Individual matching degree represents the degree of trust in the fault diagnosis results given by each diagnostic method. Accordingto the transformed individual matching degree, the confidence level of multi-fusion results of multi-fault diagnosis results is determined by pre-established confidence rule database. The confidence rule base is established according to several fault fusion samples in advance, and the confidence level represents the trust degree of each fusion result. According to the confidence of the fusion results, the final fault diagnosis results are determined. The technical scheme improves the accuracy of the fault diagnosis result and ensures the efficient and safe operation of the equipment.