The invention relates to a method for planting plants by improving a deep groove and restoring salinate fields in situ; the method comprises the following steps: for planting plants, deep-groove strip tillage is carried out on the salinate; cornstalk tents are vertically laid at the four walls of the deep groove; a layer of cornstalk, a layer of cow dropping and a layer of cornstalk are laid at the bottom of the groove, then a layer of luvisol is added, the cornstalk, the cow dropping, the cornstalk and the luvisol with equal quantity are added to the ground surface and then saline-alkali reducing agent of 0.3 to 0.5L/m<2> is poured; then the artificially improved soil is applied; a drainage ditch is established between the adjacent grooves and a reservoir is arranged beside the groove; and finally the plants are planted.