A combination heat sink including a first radiating element having a first plane section and a second radiating element having a second plane section. Multiple first radiating fins integrally upward extend from the first plane section. Each two adjacent first radiating fins define therebetween a first connection section. Multiple second radiating fins integrally upward extend from the second plane section. Each two adjacent second radiating fins define therebetween a second connection section. The first and second radiating elements are connected with each other in an alternating manner with the first radiating fins attaching to and contacting with the second radiating fins to form the heat sink.