The invention relates to a front function expansion module, particularly relates to a front function expansion module of a forestry modular quick assembly working platform, and belongs to the field of forestry machinery. The front function expansion module comprises a framework, an expansion tool connecting seat, two wheels and two travel driving hydraulic motors. The two travel driving hydraulic motors are respectively mounted on two sides of the framework, each wheel sleeves a rotary shaft of the corresponding travel driving hydraulic motor, each travel driving hydraulic motor is connected with a power module quick interface by a quick interface, power and hydraulic circuits can be supplied by quick interfaces s of a power module, and the expansion tool connecting seat is mounted on the upper surface of the framework. The front function expansion module has the advantages that basic operation devices can be connected, positioned and mounted by the aid of the front function expansion module, and the stability of the platform can be guaranteed.