The invention discloses a technology for planting vetiver grass for rice stem borer luring, pollutant intercepting and soil fixation in a paddy. According to the technology and method, the pesticide dosage and non-point source pollution of a paddy can be reduced, the vetiver grass serves as a luring plant for luring and killing rice stem borers, servers as a pollution runoff nutrient intercepting plant and is transplanted at the two sides of a paddy ditch or a non-aisle ridge or a corner land or a wet land, the line spacing is 30cm-40cm, and the planting spacing is 25cm-35cm. After the vetiver grass grows up to a clump, on one hand, the rice stem borers can be lured by the vetiver grass to lay eggs in a concentrated mode and is killed in a concentrated mode, so that the land pesticide using dosage is reduced and environment pollution is relieved; on the other hand, developed roots of the vetiver grass are used for fixing soil and nutrients flowing from a farmland are intercepted through the established vetiver grass ecological ditch or the established vetiver grass wet land, a water body is purified and the environment is protected. The technology for planting the vetiver grass for rice stem borer luring, pollutant intercepting and soil fixation in the paddy is applied to a rice production zone in the south and has the dual effects of soil fixation, pollution interception, vetiver grass luring and pesticide reduction.