The present invention relates to a new structure of an agricultural fan which can be effectively used outdoors. The agricultural fan according to the present invention includes: a support base (10) for supporting a head (1) of a lawn mowing machine so that a rotary shaft (1b) faces forward; a fan blade (20) coupled to the rotary shaft (1b) or a connection shaft (70) coupled to the rotary shaft (1b) and be rotated together therewith when rotating the rotary shaft (1b) to generate wind forward; and a safety net (40) coupled to the head (1) or a holder (30) coupled to the head (1) to surround the periphery of the fan blade (20). When a driving device (20) of the lawn mowing machine is driven, the fan blades (20) is rotated to generate wind, and a throttle lever (4) of the lawn mowing machine is operated to adjust the rotational speed of the fan blade (20).
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