The invention relates to a water purifying device, in particular to an efficient water purifying plant for agricultural water and aims to solve the technical problems and provide the efficient water purifying plant which is easy to operate, time-saving, labor-saving and convenient to move and is used for agricultural water. In order to solve the technical problems, the efficient water purifying plant for agricultural water is provided and comprises a trolley, a support rod, a water tank, a stirring box, a water pump, a right bracket, a flexible pipe, a slide rail, a spray head, a fixing plate, a slider, a rack, a gear, a filtering box, a first feeding hopper, a first filter net, a granular activated carbon filter element, purifying media, a precise compressed activated carbon filter element, a first water outlet pipe, a second feeding hopper, a rotary rod, stirring blades, a motor, a small belt pulley, a flat belt, a large belt wheel, a second water outlet pipe and a valve. The efficient water purifying plant is easy to operate, time-saving, labor-saving and convenient to move, realizes convenient and rapid water purification and can further be used for spraying and irrigating crops.