The invention provides a novel suspension structure of an arc ceiling and an installation method of the novel suspension structure. The suspension structure comprises ceiling units, supporting rods, a keel and at least two suspension rods. The keel is fixed to a ceiling carrier through the suspension rods; the upper ends of the supporting rods are fixedly connected with the keel, avoiding grooves matched with the ceiling units are formed in the lower ends of the supporting rods in the radial direction, and through connecting holes are formed in the two sides of each avoiding groove; each ceiling unit comprises a plurality of single-sheet ceiling board sets, each single-sheet ceiling board set is formed by bonding two single-sheet ceiling boards, the distance between every two bonding points on each single-sheet ceiling board set is the same as the distance between every two supporting rods on the keel, and the bonding points between the single-sheet ceiling boards and the bonding points between the single-sheet ceiling board sets are staggered in position; the single-sheet ceiling boards of the ceiling units are connected in the avoiding grooves in an inserted mode, and every two ceiling units are connected together in a threaded mode by inserting a fixing pin into the corresponding connecting holes. By means of the novel suspension structure of the arc ceiling and the installation method of the novel suspension structure, the suspension structure and the installation process are simplified, and meanwhile the suspension firmness is improved.