The invention discloses a radial crimping device for catenary pipe type parts and a method thereof. The crimping device comprises a crimping machine, the crimping machine comprises eight linkage shafts, and the crimping device further comprises a crimping die and a positioning tool; the crimping die is composed of eight independent fan-shaped dies, the eight fan-shaped dies form a cylinder with athrough hole, and the outer surface of the cylinder is fixedly connected with eight linkage shafts of the crimping machine through positioning pins; the positioning tool comprises a positioning plate,a positioning clamp and a positioning table, wherein the positioning plate is located on one side of the crimping die and is in mechanical connection with the crimping machine, the positioning clampis close to the crimping die, the positioning clamp penetrates through the positioning plate and is connected with the positioning plate through bolts, a concave cavity is arranged on the positioningclamp, and the positioning table is located on the other side of the crimping die. According to the crimping device and the crimping method, the obtained pipe type parts can achieve reliable connection, the stress concentration can be avoided, internal defects can be eliminated, and the safety of long-term service of the catenary parts can be improved.