The present invention relates to a duodenum built-in jejunum cannula releasing system and a use method therefor, the system comprising: an implanting device, a pushing assembly, a fixing line and a releasing line. The implanting device comprises a storage pipe shell, a releaser, a membrane pipe and a stent； the storage pipe shell is tubular and is provided with a near-end opening and a far-end opening； the membrane pipe and the stent which are to be released are arranged in the storage pipe shell in a folded state； the pushing assembly comprises a push-pull guiding wire, an inner pipe, a middle pipe and an outer pipe which are sleeved with one another from the inside out in sequence and may move relative to one another； one end of the releasing line is fixed to the inner pipe, and the other end thereof is a free end； one end of the fixing line is fixed to the middle pipe, and the other end thereof cooperates with the free end of the releasing line to form a movable buckle which is connected to the membrane pipe, the releaser and the inner pipe, then drawn out from the middle pipe and fixed onto a pulling line rotary knob. The present invention has the advantages of a simple structure and simple operation.
