The invention discloses nickel-free white copper alloy containing rare earth additional elements and a method for processing plates made of the same. The nickel-free white copper alloy comprises the following components in percentage by weight: 0.02 to 0.1 percent of rare earth elements, 5 to 20 percent of zinc, 8 to 18 percent of manganese, 0.5 to 2.0 percent aluminum, 0 to 0.5 percent of iron, 0 to 0.5 percent of titanium, 0 to 0.1 percent of zirconium and the balance of copper. An alloy processing method comprises the following major technological processes of: alloy smelting and casting, hot rolling, thermal annealing, cold rolling and the like. The method is characterized in that: copper, zinc, manganese and aluminum are taken as main alloy elements; rare earth elements such as lanthanum, cerium and iridium as well as trace elements such as iron, zirconium and titanium are added in an alloy smelting process; and a human-friendly and environmental-friendly nickel-free white copper alloy plate is manufactured by the technological methods of high-temperature alloying, degassing, impurity removing, casting, cast ingot hot rolling, thermal annealing, cold rolling, finished product annealing and the like.