The invention provides a method for eliminating landslide mass area terrace interflow. The method includes the following steps: a, excavating a drainage ditch on a terrace; b, laying a layer of clay in the drainage ditch; c, placing a drainage pipe with water seepage holes uniformly arranged on the peripheral wall by 180 degrees in the drainage pipe, enabling a face with the water seepage holes to be upward and a portion without the water seepage holes to be buried in the clay, and compacting the clay; d, laying a layer of gravel of 8-13cm in thickness on an upper half of the drainage pipe, and laying geotechnic cloth to wrap the gravel; e, laying a layer of straw and fly ash; f, backfilling soil and hierarchically compacting to be flat; arranging a transverse furrow along a ridge of a previous step of the terrace in each step of the terrace. By the method, surface water seeping in the landslide mass area terrace and interflow formed by the surface water can be effectively eliminated, so that technical obstacles when a landslide area is reclaimed to be a terrace are overcome. The method has the advantages of being low in cost, simple, convenient, high in efficiency, easy in operation and the like, and is convenient for large-scale popularization and use.