To provide a steel pipe pile cutting device which cuts a steel pipe pile with good workability without always needing a worker while silencing a cutting sound and producing no chips, and also cuts the steel pipe pile at an optional height and neatly with high levelness without deflection of a cutting edge.

This steel pipe pile cutting device 100 cutting the steel pipe pile 101 driven as a soft ground countermeasure, in an orthogonal direction to a driving direction, comprises: a support part 10 mounted to the steel pipe pile 101; a driving part 20 having a rotation body 21 on the support part 10 and driving the rotation body 21; and a cutting part 30 fitted to the rotation body 21 to cut the steel pipe pile 101 while rotating around a peripheral wall 102 of the steel pipe pile 101.