The utility model discloses an assembly type high voltage single-core cable concrete groove, comprising base plates; a short side part is provided with two short side holes, and a long side part is provided with two long side holes, wherein the short side holes and the long side holes are symmetrically arranged. When two base plates are in butt joint, spaces between the short side holes and the long side holes are equal; the short side holes and the long side holes are inserted by columns. Bottoms of a short side plate and a long side plate are provided with column holes. The base plates are provided with two positioning slots parallel with a short side and symmetrically arranged. The positioning slots are inserted by separator plates extending upwards; upper part of the short side plate and the long side plate are buckled by a cover plate having a shape consistent with the base plates. The assembly type high voltage single-core cable concrete groove has a reasonable structure, and can be extended and laid in a straight line, and be laid in arc in dependence on turning needs anytime and anywhere; the assembly type high voltage single-core cable concrete groove has the characteristics of tight joint, smooth transition, simple construction, high efficiency, great cable safety, small storage occupation space, and convenient transportation, and is not easy to damage.