The invention discloses a penetrating support positioning device and relates to the field of penetrating support positioning. The base is of a long-short stretching structure and is used for supporting and fixing; the bottom ends of the suspension supporting frames are arranged at the two ends of one side of the base in the length direction, and movable rails are arranged on the suspension supporting frames; the two ends of the positioning rod are arranged corresponding to the movable rails, the positioning rod slides up and down on the movable rails, and fixing pieces are arranged between the positioning rod and the movable rails and used for fixing the positioning rod and the suspension supporting frame; and the indicating rod is arranged on the positioning rod, is vertical to the direction of the positioning rod and is used for assisting in positioning. According to the scheme, the extensible base is used for being matched with different length requirements, the positioning rod is movably connected with the suspension supporting frame, and the positioning rod is movably connected with the indicating rod for assisting positioning.