Saline-alkali water treatment device for improving agricultural and light complementary saline-alkali soil

The invention relates to the technical field of saline-alkali water treatment, and provides a saline-alkali water treatment device for improving agricultural and light complementary saline-alkali soil, which comprises a mounting beam, a sliding rail, a moving assembly, a mounting bracket, an air cylinder, a mounting seat, a driving assembly, a driven assembly, a fresh water extraction assembly and a control assembly, the mounting beam is fixed on a supporting leg of the agricultural light complementary device; the slide rail is fixed on the lower side of the mounting beam; the moving assembly is movably installed on the sliding rail. The mounting bracket is mounted on the lower side of the moving assembly; the cylinder is mounted on the mounting bracket; the mounting seat is mounted on the lower side of the mounting bracket; the driving assembly is movably mounted on the mounting seat; the driven assembly is movably mounted in the mounting seat and can be driven by the driving assembly; the fresh water extrac