Cloud motion vector measuring device and method

The invention provides a cloud motion vector measuring device and method. The cloud motion vector measuring device comprises a central illumination sensor, a plurality of outer-layer illumination sensors and an information processing circuit, wherein the plurality of outer-layer illumination sensors and the central illumination sensor are arranged on a horizontal plane under the same illuminationcondition; the plurality of outer-layer illumination sensors are uniformly arranged on a semicircle; the circle center of the semicircle coincides with the central illumination sensor; the time interval between the irradiance change moment of each outer-layer illumination sensor and the irradiance change moment of the central illumination sensor is calculated; when the time interval between the irradiance change moment of one outer-layer illumination sensor and the irradiance change moment of the central illumination sensor is the maximum, the cloud motion direction is in the connecting line direction of the outer-lay