A heatsink module used for dissipating heat generated by a heat generating component is provided. The heatsink module includes a heat pipe, a heatsink fin assembly, a fan blade motor set, a fan shell, and an external cover. The heat pipe conducts the heat generated by the heat generating component to the heatsink fin assembly. The fan blade motor set, disposed in the fan shell and covered by the external cover, operates to generate an airflow passing through the heatsink fin assembly to dissipate the heat on the heatsink fin assembly. The fan shell has a plurality of buckling components, and the external cover has a plurality of matching components disposed at the edge corresponding to the buckling components, such that the buckling components and the matching components are buckled together when the external cover is covered on the fan shell, so as to fast combine the parts.