Abstract: As a new type of agricultural machinery, UAV plays an increasingly important role in the process of agricultural production, which effectively promotes the development of modern agriculture.In order to accurately obtain the information of farmland, UAV is applied to the design of farmland information acquisition system.Based on image fusion processing technology, it improved the clarity of image information and avoided the information loss caused by image exposure.It improved the accuracy of information image mosaic based on English language database.Finally, taking the acquisition of farmland information as an example, the whole farmland information collection is completed by dividing the information acquisition area and calibrating the position information coordinates.Finally, it realized the image mosaic.