The invention discloses a free-form optical reflector for an LED (light-emitting diode) motorcycle high beam, wherein an internal surface of the reflector is a free-form surface to form an optical reflecting surface; the bottom surface of the reflector is an opening; an LED light source is installed at the centre of the opening; one end rightly facing the bottom surface is a light exit port of the reflector; the minority of light emitted by the LED light source directly shines on an illuminating surface, and the majority of the light is reflected by the internal surface of the reflector and then is emergent to the illuminating surface. The light energy emitted by the LED light source is emergent after being reflected by the freeform reflector, so that the loss is reduced and the utilization rate of light energy is improved. The reflector is small in size and has a low glare effect and meets the light distribution requirements in GB5948-1998. In addition, a heat-radiating device and the LED light source are conveniently installed, and the heat dissipation efficiency of the overall lamp is favorably improved.