The invention discloses a method for acquiring discrete state parameters of a power transformer, which solves problems of difficult power transformer state parameter recognition and difficult power transformer multi-source data mining. According to the invention, a discrete gas state parameter is acquired by adopting an improved equal width method according to the type and the content of dissolved gases in tested power transformer oil; a discrete partial discharge state parameter is acquired by adopting an information entropy decision tree method according to a discharge capacity statistical parameter, a discharge phase statistical parameter and a number of discharge statistical parameter; a discrete winding state parameter is acquired by adopting a binning method according to winding deformation and short-circuit current; and a discrete mechanical state parameter is acquired by adopting a chi-square test method according to the transformer temperature, vibration and noises. The method disclosed by the invention is applicable to the fields of power equipment detection and data mining, has the characteristics o f accurate data, high work efficiency, wide fault coverage, easy computer processing and the like, and has high economic values and broad market application prospects.