The invention relates to the field of heat dissipation device manufacturing, and discloses a core leveling device. The core leveling device comprises core leveling arms and a movable arm mechanism. The core leveling arms are provided with a detachable leveling plate. The core leveling arms can drive the leveling plate to overturn. The movable arm mechanism is connected with the core leveling arms. The movable arm mechanism is used for making the core leveling arms horizontally move in the direction perpendicular to the overturning direction. The core leveling device can be adaptive to leveling plates of different sizes and types.