the disclosure provides a heat sink for electrical elements and a light - emitting device containing thereof . the heat sink includes a radiating substrate and at least one hollow radiating channel . in which , the hollow radiating channel is horizontally embedded in the radiating substrate , and has two openings disposed on the same site or the opposite sites of the radiating substrate , so that gas may flow in the hollow radiating channel and remove heat of the radiating substrate . and a light - emitting device containing the heat sink is also provided .