The utility model discloses a mould of die -casting aluminium carborundum bottom plate, the top surface of mould set up from last to communicate in proper order down be used for holding the carborundum prefab basic board cavity, the infiltration of aluminium liquid forms aluminium column's post hole when being used for holding aluminum plate's aluminum plate groove and being used for die -casting, the post hole is the blind hole. The aforesaid is used for the mould of die -casting aluminium carborundum bottom plate, has offered basic board cavity, aluminum plate groove and post hole in the mould, holds the carborundum prefab in the basic board cavity, and the aluminum plate groove holds aluminum plate. During die -casting, plus the infiltration from the carborundum prefab of aluminium liquid forms aluminium carborundum base plate with the carborundum prefab, permeates the post hole shape simultaneously and becomes aluminium column to aluminum plate is in the molten condition, and cooling back aluminum plate, aluminium carborundum base plate and aluminium column become an organic whole. The aluminium column snap -on is on aluminum plate, and aluminum plate and carborundum base plate coupling phase compare aluminium column and combine the area increase with the carborundum base plate, above -mentioned mould, and simple structure can be used to the preparation and obtains that the radiating effect is good, aluminium column firm in connection's aluminium carborundum bottom plate.