A heat dissipation coating layer contains: a binder and a core-shell heat dissipation filler. The core-shell heat dissipation filler is synthesized in a water bathing process at the temperature within 20° C. to 100° C. The core-shell heat dissipation filler includes a metal core and a shell composed of the mixture of oxide and hydroxide shell. Here the metal core has metal particles, and the shell has a porous structure consisted of a mixture of metal oxide and porous metal hydroxide.