The invention relates to a constructional engineering basement pipeline laying casing pipe groove arrangement digging device, and the device comprises an L type guiding mechanism and two sets of moving blocks arranged in the L type guiding mechanism in sliding form, a link mechanism is arranged between the moving blocks, two ends of the link mechanism are respectively in hinge joint with the moving blocks, and back surfaces of the moving blocks are provided with detachable slotting mechanisms. In the constructional engineering basement pipeline laying casing pipe groove arrangement digging device, the two sets of moving blocks are connected together through the link mechanism, when one set of moving block drives the slotting mechanism to move, the other set of moving block moves with the previous set of moving block under action of the link mechanism, thus, simultaneous slotting of a horizontal groove and a vertical groove is realized, and slotting efficiency is improved. According tothe constructional engineering basement pipeline laying casing pipe groove arrangement digging device, by a guiding function of an L type through hole to the moving blocks, and the grooves formed by the slotting mechanism can be more straighter; and in the constructional engineering basement pipeline laying casing pipe groove arrangement digging device, by rotation of a rotating rod, a cutting disk of corresponding width can be rotated to a position of a transmission shaft, thus, grooves of different width can be formed, and an adjusting process of width of the cutting disk is simplified.