The utility model relates to a centering device for installing a vertical pipeline. The centering device comprises three groups of L-shaped support frames which are assembled to form an assembled support frame at an included angle of 120 degrees, the assembled support frame is positioned at the upper part of a steel pipe, a tray is positioned at the bottom of the steel pipe, a connecting plate is positioned at the middle part of the assembled type support frame, a connecting plate round hole is formed in the center of the connecting plate, and a steel wire rope passes through the connecting plate round hole; support frame round holes are formed in the vertical edges of the L-shaped support frames, nuts are fixed at both sides of each support frame round hole, and bolts pass through the nuts and the support frame round holes. According to the utility model, the stable and accurate lifting of the vertical pipeline can be smoothly implemented through the centering device in the center of the upper part of the pipeline and the tray at the bottom of the pipeline, the construction safety can be guaranteed and the construction efficiency can be increased. The centering device has the advantages of simple arrangement structure, convenience for operation and usage and high practicability.