The invention relates to a long-distance continuous liner 
pipe and short 
metal pipe composite device, which comprises a plurality of short 
metal pipes in the outer layer and a liner 
pipe in the inner layer, and the plurality of short 
metal pipes are connected end to end; it also includes a 
coupling.  There are female threads inside the 
coupling mentioned above, male threads at both ends of the short metal pipes, the ends of two adjacent short metal pipes are screwed into the 
coupling and engaged with the female threads of the coupling through the male threads, and the two  The ends of short metal pipes are tightly butted.  The invention also provides a preparation method of the long-distance continuous lining pipe and short metal pipe composite device.  The invention can overcome the problems of difficult alignment and deviation caused by welded pipes, resulting in stuck or scratched lining pipes, and can realize tight butt joints between short metal pipes; at the same time, because no 
welding technology is used, the  The temperature of the pipeline is low, and the traction operation can be carried out section by section, which overcomes the disadvantages of long-distance traction, saves trouble and labor, and greatly improves the operating efficiency.