The invention discloses a quinacridone quaternary ammonium salt compound. A structural formula is shown as a general formula B, and the definition of each substituent is detailed in the description. The quinacridone quaternary ammonium salt compound has good electroplating performance and can produce a synergistic inhibition effect with other electroplating additives, and the electroplating performance of the quinacridone quaternary ammonium salt compound is verified through a cyclic voltammetry curve, a polarization curve and a continuous current timing addition curve.