A Modular Concrete Interlocking Box System and method for constructing the same, comprising at least two rectangular caps having two short sides, two long sides, and a consistent thickness from a first cap overhang to a second cap overhang, including at least two notches located adjacent to each overhang along one long side of the cap, and at least two rectangular panels having two short sides, two long sides, and a consistent thickness from a first panel overhang to a second panel overhang, including at least two notches adjacent to each overhang along both long sides of the panel, such that the notches and the overhangs are constructed and arranged to fittingly interlock the caps with the panels such that a four sided box is formed having the overhangs provide an external leverage grip to easily align the courses and square the internal corners of the four sided box.
