The invention relates to a preparation method of alloy thin strip magnets of Sm(Co,Cu,Fe,Zr)-z types and relates to a magnet containing hard magnetic materials of a rare-earth metal and magnetic transition metals. The preparation method comprises the following steps: presenting a chemical composition formula in a melt of Sm(Cox Cuy Feu Zrv) z; rapidly quenching the melt on a cooling molybdenum roller or a copper roller rotating at a peripheral speed of 5-40 m/s by a melt rapidly quenching furnace or a vacuum melting rapidly quenching continuous furnace to obtain melt thin strips of Sm(Co,Cu,Fe,Zr)-z types; pulverizing the melt thin strips into powder; pressing the powder into blocks in a magnetic field larger than 1T; and compacting the blocks in a cold isostatic press before final heat treatment. The invention provides three heat treatment processes and accordingly obtains the practical block alloy thin strip magnets of Sm(Co,Cu,Fe,Zr)-z types with different characteristics.