The invention discloses a preparation method of high-structure carbon black. The preparation method comprises a combustion step and a generating step; in the combustion step, an electromagnetism or plasma mode is introduced to conduct heating while feedstock oil is in imperfect combustion; and in the generating step, aromatic hydrocarbon solutions are added. The preparation method has the advantages of strong operability and simple process. The invention further provides the high-structure carbon black, the oil factor of the carbon black is high, the DBP absorption value is larger than 200x10<5>m<3>/kg, and the highest DBP absorption value can reach 450x10<5>m<3>/kg. In the application of the conductive carbon black, the consumption of the carbon black can be reduced, and the dispersity and electrical conductivity of the carbon black can be significantly improved.