Fan fixing device for heat dissipation module

The utility model relates to the technical field of notebook computer accessories, in particular to a fan fixing device for a heat dissipation module, which comprises a positioning outer shell, a combined inner shell is embedded in the positioning outer shell, and an axial flow fan body is rotatably mounted in the middle of the combined inner shell. The axial flow fan comprises an axial flow fan body, a combined inner shell, a pull rod, a positioning outer shell and a central guide rod, sliding grooves are formed in the two sides of the bottom end face of the interior of the positioning outer shell in an integrated pouring forming machining mode, the central guide rod is embedded in the sliding grooves, and a spring is connected to the outer portion of the upper portion of the central guide rod in a sleeved mode. The central guide rod, the sliding block, the spring, the axial flow fan body, the combined inner shell, the pull rod, the positioning outer shell and the sliding grooves are arranged; when the pull