The invention relates to a deep trench excavation rapid forming machine comprising a bracket arm arranged on a moving vehicle. A milling wheel is arranged on the bracket arm in a rotating manner. A wheel core of the milling wheel is horizontal and is connected with a drive mechanism. The drive mechanism drives the milling wheel to rotate. A pipeline feeding mechanism is further arranged on the side of the moving vehicle. A pipeline laying mechanism is arranged at a discharge port of the pipeline feeding mechanism. An outlet of the pipeline laying mechanism is horizontal and points to the tailend of the moving vehicle. The moving vehicle carries the milling wheel to move along a construction base plane, the drive mechanism drives the milling wheel to rotate, and therefore excavation operation of a deep trench is achieved; and after deep trench excavation is completed, the pipeline feeding mechanism is started to lead and send pipelines into the pipeline laying mechanism and then the pipe laying operation is achieved.