The invention provides a land testing device based on agriculture development. The land testing device comprises a U-shaped trough, light shielding cloth, a disc spring, a rotating rod, a storage trough, a hollow column and a circular cleaning brush. The U-shaped trough is arranged at the middle position of the front end surface of a mounting board. The back end surface of the light shielding cloth is fixed to the back end surface of the U-shaped trough. The front end surface of the light shielding cloth is arranged at the back end surface of a U-shaped rod. The land testing device realizes functions of shielding sunlight and facilitating display screen observing. The disc spring is assembled at the middle position of the left end surface of the storage trough. The rotating rod is connected with the storage trough through the disc spring. The storage trough is arranged at the middle position of the front end surface of the mounting block. The land testing device realizes a function ofdustproof performance of the display screen. The hollow column is connected with an electric push rod through a connecting rod. The circular cleaning brush is assembled in the hollow column. The landtesting device has advantages of high speed in cleaning the testing rod, high convenience in use, clear data observation on the display device, effective dustproof function on the display screen, highspeed in cleaning the testing rod, and high reliability.