An automotive underground cable laying device is mainly composed of a first support arm, a second support arm, a plough body, a conducting wire tube, a first transverse arm, a second transverse arm, a compacting wheel, a soil-covering plough blade, an iron plough blade, a third support arm, a fourth support arm, a first vertical arm and a second vertical arm; the automotive underground cable laying device is capable of rapidly realizing the functions of ditching, laying of cables, backfilling of soil and compaction; the working efficiency and the laying quality are improved; the manpower cost is reduced; and the automotive underground cable laying device has good application prospect.