<p>The present invention relates to an LED encapsulant composed of a siloxane hybrid resin. The present invention provides the LED encapsulant composed of the siloxane hybrid resin manufactured by a hydrosilylation reaction of a fat liquor composed of organic oligosiloxane and an organohydrosilicon compound under a metal catalyst, wherein the siloxane hybrid resin satisfies 1.52 or more of a refractive index and 95% or more of transmittance; implements 78 of shore hardness (D) as average hardness by being rapidly hardened; and has excellent thermal stability by having a yellowness index of less than 10 for at least 72 hours under a temperature condition of 200°C.</p>
