The invention discloses an image boundary element processing method. The image boundary element processing method comprises the following steps of: S01, converting a multi-dimensional image from a physical space to a computing space, wherein the step S01 comprises the following steps of: S011, judging whether the multi-dimensional image has a singularity boundary or not, if so, entering the step S012, and if not, entering the step S013; S012, eliminating the singularity boundary by utilizing a smoothed particle, and entering the step S013; and S013, performing mesh generation of the multi-dimensional image, and converting into the computing space; S02, solving a divided mesh boundary by utilizing a boundary integral equation; S03, performing accelerated convergence of the mesh boundary by utilizing an extrapolation method; and S04, constructing an internal field and an external field of the mesh boundary. According to the image boundary element processing method disclosed by the invention, the physical space of the image is converted into the computing space by utilizing a smoothed particle method; the converted computing space is suitable for the extrapolation method; therefore, the computing precision is increased; and the mesh processing number is reduced.