The invention discloses a wind field measurement platform below a rotor wing of an unmanned plane, and the platform comprises a power supply, a rack, a rotor wing installation part, a three-dimensional moving mechanism, and an anemograph disposed on the three-dimensional moving mechanism. The rotor wing is installed in the rack in an inward manner through the rotor wing installation part, and is fixed at the center of the top of the rack. The three-dimensional moving mechanism is installed at one side of the rack, and the anemograph is driven by the three-dimensional moving mechanism to stretch into the rack and move in the rack in three directions, and achieves the measurement of all points of a wind field below the rotor wing with no internal barrier. The platform is simple in structure, is convenient to operate, and can measure the wind speeds of plurality of points in the wind field stably and precisely. The platform belongs to the field of agricultural unmanned planes.