The invention relates to the field of earthwork treatment methods, in particular to a power transmission line tower foundation construction residual soil treatment method. Measuring points are arranged on the tower foundation; obtaining elevation values of the measuring points; calculating a three-dimensional numerical value elevation model of a tower foundation construction site; calculating theterrain slope value of the tower foundation construction site through the obtained elevation value, identifying the tower position category of the construction site based on the terrain slope value, calculating the earthwork, namely spoil, which cannot be automatically consumed in the tower foundation construction process through a three-dimensional numerical value elevation model, and selecting acorresponding residual soil treatment scheme according to the tower position category and the spoil amount. According to the residual soil treatment scheme adopted by the invention, the residual soilamount generated by excavation can be accurately estimated; According to the method, the absorption amount of self-backfilling and the soil abandoning amount which cannot be backfilled finally duringconstruction are considered comprehensively with the terrain slope, a residual soil treatment scheme completely corresponding to the terrain structure is selected, the landform of the tower foundation can be matched to the maximum extent, and environmental damage and water and soil loss are reduced.