The present invention provides a beauty instrument, comprising: a housing with vents therethrough as an air inlet or air outlet; a control circuit board in the housing; a light source assembly in the housing and electrically connected with the control circuit board; and a thermoelectric cooling assembly. The thermoelectric cooling assembly comprises: a thermoelectric cooler, a heat sink, a fan, and a heat transfer assembly. The heat transfer assembly comprises a VC or an ALVC or an Aluminum Heat Pipe. The heat transfer assembly is thermally connected between the heat sink and the hot side of thermoelectric cooler. A front end of the beauty instrument has a light outlet surface; the cold side is connected to and cool the light outlet surface, or the cold side serves as the light outlet surface, thereby, the light outlet surface is able to cool skin in contact.