The traditional preisach model has the characteristics of the secondary loop consistency, and the hysteresis characteristics of the piezoelectric ceramic actuator do not satisfy its characteristics. The traditional Preisach model has low modeling accuracy, so an improved Preisach model is proposed in this paper. The discretization method is derived and its numerical implementation is based on the trilinear interpolation. The verification of the experimental design and results of this algorithm are carried out on the E625 series piezoelectric ceramic controller platform fabricated by PI Company. The experimental results show that the preisach model based on trilinear interpolation method proposed in this paper has a maximum absolute error of 0.2 μm, which improves the precision of the piezoelectric ceramic preisach model.