Farmland quantitative irrigation device

The farmland quantitative irrigation device comprises a movable frame, a containing box, a water storage box, a one-way valve, a connecting pipe and a spray head, the bottom of the water storage box is installed on the top of the movable frame, scale marks are sprayed on the front side of the water storage box, the one-way valve is installed on one side of the water storage box in a penetrating mode, and one end of the connecting pipe is fixedly installed on one side of the one-way valve. One side of the spray head is fixed to the other end of the connecting pipe, a magnetic top cover is mounted at the top of the water storage tank, a filter plate is placed in the water storage tank, a pH value adjusting type stirring assembly is fixedly mounted at the top of the magnetic top cover, a mounting groove is formed in the top of the moving frame, and an angle adjusting type moving assembly is fixedly mounted in the mounting groove; the agricultural irrigation device can adjust the pH value of irrigation water, can