The utility model discloses a prefabricated electric cable tube ditch belongs to electric power construction technical field, including a plurality of trench monomers of arranging side by side together, the trench monomer includes the base plate, locate left base and right base on the base plate, locate left base top left footstock, locate the right footstock and the apron at right base top, left side base includes horizontally left side bottom plate and vertical left side board, and the bottom of left side board links in the left end of left bottom plate, right side base includes horizontally right side bottom plate and vertical right side board, and the bottom of right side board links in the right -hand member of right bottom plate, left side footstock includes integrated into one piece's left vertical portion and the left arc portion that is located the vertical portion top in a left side, and right footstock includes integrated into one piece's right vertical portion and the right arc portion that is located the vertical portion top in the right side. The utility model provides a prefabricated electric cable tube ditch can arrange the trench monomer according to construction situation, makes the trench satisfy cable laying's operation requirement. The shaping is pour in advance to the trench monomer, can directly come into operation, is favorable to shortening construction period.