Copper alloy with no lead

The present invention relates to a copper alloy, in particular a lead-free free-cutting copper alloys. Of 55.0-89% Cu, 3.0-45% Zn, 0.1-10% Sn, 0.1-2.0% Ni, 0-5.0% Si, 0.1-5.0% Bi, 0.1-3.0% Se, 0.01-1.0% Al, 0.05 -0.15% P, 0.01% -0.5% RE composition. REs, bismuth, selenium, phosphorus, respectively, rare earth, copper, bismuth, selenium and copper, phosphor bronze alloy or intermediate bismuth selenium, copper-phosphorus alloy added separately. The present invention can eliminate the use of lead in the production and recycling process and to the environment and harm to human body; has good cutting performance, mechanical properties and hot workability; good flow properties, good casting properties, thermal cracking tendency; Production simple process, can be prepared in a conventional lead brass manufacturing equipment; low bismuth, selenium, rare earth content, without increasing too much the production cost.