The eddy current loss, produced in the solid stator and thrust disk by a time-dependent field, limits the operation performance of magnetic thrust bearings. Therefore, the accurate modeling of eddy current loss is essential for them. This article presents an analytical model to calculate the eddy current loss for a magnetic thrust bearing. After dividing the magnetic thrust bearing into several parts according to flux distributions, the eddy current loss expression for each iron part is proposed by solving one-dimensional diffusion equations and integrating power density over the volume. As the boundary condition of the magnetic field problem, the surface magnetic field intensity is confirmed by a fractional transfer function. Finally, the validity of this model is verified by finite element method analysis and experimental measurements. Based on the above analysis and research, this modeling method can be used as a reference for the eddy current loss calculation of nonlaminated actuators.