The utility model relates to a have the novel vibration -isolation buffer of high quiet low dynamic stiffness characteristic, especially relate to diaphragm formula molecule spring vibration -isolation buffer, this vibration -isolation buffer specially adapted heavy load low frequency vibration isolation field. Diaphragm formula molecule spring vibration -isolation buffer's direction barrel casing is put in the cylinder body outside, the inside mixed medium of molecule spring of packing of cylinder body, pass through hinge joint between about guide cylinder and the cylinder body, the one end of piston fix guide cylinder inboard top, the other end extend go into the cylinder body in, the top of cylinder body sets up the end cover, arranges the diaphragm between cylinder body and the end cover, the piston passes the end cover and contacts with the diaphragm, the mixed medium of molecule spring mix with the porous hydrophobic particle that contains the nanometer pore by water and form. The utility model provides a diaphragm formula molecule spring vibration -isolation buffer, it has a high bearing capacity, and low natural frequency's characteristics extensively are applicable to the vibration isolation demand of equipment, the especially heavy machinery equipment in engineering field.