A wind farm, comprising a) a plurality of wind power generation units (A1-A3, B1-B3, C1-C3, D1-D3), each wind power generation unit including: a1) a rotation axis defined as horizontal rotation; a2) a hub located at a first end portion of the rotation axis; a3) at least two airfoil blades radially mounted on the hub; a4) a pitch control system configured to adjust a pitch angle of the blades mounted on the hub; and a5) a yaw control system configured to horizontally rotate the rotation axis of a nacelle on the base of a tower in order to align the direction of the rotation axis with a wind direction, wherein the wind farm includes: b1) at least two first-direction wind power generation units (A1, C1) spaced apart from each other at a predetermined interval in a back and forth longitudinal direction 1 and whose blades are rotated in a same direction; and b2) at least one second-direction wind power generation unit (B1') that is located between the first-direction wind power generation units (A1, C1) in the longitudinal direction 2 and has blades rotating in an opposite direction to a rotational direction of the blades of the first-direction wind power generation unit (A1, C1). a) a plurality of wind power generation units (A1-A3, B1-B3, C1-C3, D1-D3), each wind power generation unit including: a1) a rotation axis defined as horizontal rotation; a2) a hub located at a first end portion of the rotation axis; a3) at least two airfoil blades radially mounted on the hub; a4) a pitch control system configured to adjust a pitch angle of the blades mounted on the hub; and a5) a yaw control system configured to horizontally rotate the rotation axis of a nacelle on the base of a tower in order to align the direction of the rotation axis with a wind direction, wherein the wind farm includes: b1) at least two first-direction wind power generation units (A1, C1) spaced apart from each other at a predetermined interval in a back and forth longitudinal direction 1 and whose blades are rotated in a same direction; and b2) at least one second-direction wind power generation unit (B1') that is located between the first-direction wind power generation units (A1, C1) in the longitudinal direction 2 and has blades rotating in an opposite direction to a rotational direction of the blades of the first-direction wind power generation unit (A1, C1). a1) a rotation axis defined as horizontal rotation; a2) a hub located at a first end portion of the rotation axis; a3) at least two airfoil blades radially mounted on the hub; a4) a pitch control system configured to adjust a pitch angle of the blades mounted on the hub; and a5) a yaw control system configured to horizontally rotate the rotation axis of a nacelle on the base of a tower in order to align the direction of the rotation axis with a wind direction, wherein b1) at least two first-direction wind power generation units (A1, C1) spaced apart from each other at a predetermined interval in a back and forth longitudinal direction 1 and whose blades are rotated in a same direction; and b2) at least one second-direction wind power generation unit (B1') that is located between the first-direction wind power generation units (A1, C1) in the longitudinal direction 2 and has blades rotating in an opposite direction to a rotational direction of the blades of the first-direction wind power generation unit (A1, C1).