The utility model discloses a free standing type vertical pipe top connecting structure. The top connecting structure comprises a main frame and a process pipeline. The main frame comprises two stand columns, wherein the two stand columns are arranged vertically, the upper ends and the lower ends of the stand columns are connected through an upper cross beam and a lower cross beam respectively. The tops and the bottoms of the stand columns are connected with a cross beam and a diagonal bracing respectively. The free end of the cross beam is connected with the free end of the diagonal bracing, and a cross bracing is further connected between the connecting points. The lower cross beam and the cross bracing are each provided with a box-type stiffener. Each box-type stiffener is provided with a short column and a flange plate which are connected in sequence. The process pipeline is an S-shaped pipeline and is arranged in the main frame, and the two ends of the process pipeline are connected with the box-type stiffener arranged on the lower cross beam and the box-type stiffener arranged on the cross bracing respectively. One side face of the main frame is connected with a counter weight, and the counter weight is arranged on the opposite face of the diagonal bracing. The free standing type vertical pipe top connecting structure has the advantages that the drag area is small, the size is small, the weight is low, and the eccentric problem is eliminated.