The invention provides a comprehensive pipe rack labyrinth seal structure, and relates to municipal construction, in particular to a comprehensive pipe rack boss seal structure which is convenient to replace and long in service life. The comprehensive pipe rack labyrinth seal structure is arranged at the connection position of two adjacent pipe racks, and is characterized in that the comprehensive pipe rack labyrinth seal structure comprises notches and sealing pieces; the corresponding notches are formed in the end faces of the two ends of each pipe rack; after the two adjacent pipe racks are connected, the two opposite notches are combined to form a groove, and the sealing pieces are placed in the groove; the sealing pieces include water stop rubber strips and metal water stop strips, the water stop rubber strips are vertically fixed in the corresponding notches, and the metal water stop strips are horizontally fixed in the corresponding notches; and the notch in one end of each pipe rack is in a forward step shape, and the notch in the other end of each pipe rack is in a reverse step shape. According to the comprehensive pipe rack labyrinth seal structure, the groove is formed by the corresponding notches in the two adjacent pipe racks, meanwhile, a labyrinth water stop structure is formed through the staggered sealing pieces, water cannot permeate the interiors of the pipe racks until through racks surrounding the labyrinth are formed, and the sealing effect is effectively improved.