Abstract: The present invention relates to an ultrathin omnidirectional vibration-isolation metasurface structure and a design method thereof. The omnidirectional vibration-isolation metasurface structure includes a flat plate and a vibration isolation metasurface structure arranged on the flat plate. The vibration isolation metasurface structure is designed in any closed shape according to the shape and position of a vibration source. The vibration isolation metasurface structure is composed of periodically arranged supercells. Each supercell includes j unit cells with a gradient index. The unit cell is in a zigzag shape. The total reflection of elastic waves at any incident angle is realized by designing an elastic wave metasurface with a sub-wavelength thickness in the present invention, so that a vibration isolation purpose is achieved.