An air temperature-and-humidity measurement device for field plantation comprises the components of a vertical fixed rod, a bracket which is movably connected with the fixed rod, and an air temperature-and-humidity sensor assembly which is mounted on the bracket. The bracket comprises a connecting rod, a square connecting sleeve and a screw. The central hole of the square connecting sleeve sleeves the fixed rod. The side surface of the square connecting sleeve is provided with a threaded hole. The air temperature-and-humidity measurement device for field plantation has advantages of simple structure, effective prevention for mosquitoes and birds, long service life and high measurement precision.