Provided are high thermal conductive boehmite, which has the characteristics of boehmite such as flame retardancy and high filling and yet has an improved thermal conductivity, and a method for manufacturing the high thermal conductive boehmite. The high thermal conductive boehmite is characterized by having thermal conductivity calculated in accordance with the following Mathematical Formula 1 of 11.0 W/m·K or greater;
1−Vf=(λc−λf)/(λm−λf)×(λm/λc)̂(1/n)
n=3/ψ [Mathematical Formula 1]
(with the proviso that, Vf represents the volume filling ratio of boehmite, λc represents the thermal conductivity (W/m·K) of a boehmite-resin composite, λf represents the thermal conductivity (W/m·K) of boehmite, λm represents the thermal conductivity (W/m·K) of the resin, n represents the shape factor of filler particles proposed by Hamilton and Crosser, ψ represents a value calculated by dividing the surface area of a sphere that has the same volume of a boehmite particle volume by the surface area of an actual particle, and ̂ represents exponentiation).