The utility model relates to a multistage antidetonation prestressed anchorage cable is become by anchor rope, anchor plate, tray, one -level draw -in groove, second grade draw -in groove, fixed recess, backing plate, dop, buffer groove, bolt, nut and bolt hole set. Through increasing buffer at the anchor rope tip for when the country rock received impact load under seismic action, the anchor ropecan produce certain displacement in buffer, and what compensation anchor rope variation of stresses produced meets an emergency, and the stress that the messenger gathered in the twinkling of an eyeobtains the release of certain degree, prevent that the anchor rope became invalid because of the too big damage of atress under seismic action, thereby it can normally exert anchoring effect to ensure the anchor rope, improves the security of engineering.