Radiant heat reflective substrate and light-emitting element

This present invention relates to a radiant heat reflective substrate and light-emitting element for solving the space limitation problem caused while applying known cooling technology. The light-emitting element includes: a translucent substrate having a first surface, and a second surface which is opposite to the first surface and the orientation of the second surface to the first surface is defined as an emitting direction; a reflective layer, which is installed on said second surface; an infrared heat radiation layer, which is set on said second surface and locates between the translucent substrate and the reflective layer; and at least one light-emitting diode located on said first surface. Therefore, working heat produced by said light-emitting diode transmits from the translucent substrate to the infrared heat radiation layer, and dissipates in infrared radiation form in said emitting direction.