The invention discloses a preparation process of a beryllium copper alloy. The preparation process comprises the following steps: (1) beryllium oxide, copper, cobalt, nickel, titanium and furnace slagare selected according to ratios; (2) auxiliaries are paved in a graphite crucible in sequence; and a layer of furnace slag covers the top layer; (3) a mold and the graphite crucible are preheated, and then, are put in a medium-frequency induction furnace for heating by 80-120 minutes; the graphite crucible is taken out; the furnace slag on the surface is removed; the slag is removed; and moltenmetal is poured in the mold after the slag removal; (4) a beryllium copper alloy ingot is obtained by cooling; (5) the obtained beryllium copper alloy ingot is quenched by an air cushion quenching furnace; and (6) the surface of the quenched beryllium copper alloy ingot is polished and grinded. The beryllium copper alloy is excellent in wear resistance and corrosion resistance, and improves the product strength and hardness; and meanwhile, the produced product is excellent in surface quality consistency.