The invention discloses a disposable self-pressurizing intestinal stapler. The stapler comprises two pressurizing mechanisms which are anastomosed with one another and made of degradable polymer materials and a positioning locking mechanism made of memory alloy; the positioning locking mechanism comprises a plurality of memory alloy locking inserting members, two ends of each memory alloy lockinginserting member are provided with plugging heads to be correspondingly connected with the pressurizing mechanisms in an inserting mode, and the pressurizing mechanisms are connected and anastomosed with one another by adopting the memory alloy locking inserting members as connecting members. According to the stapler, after the stapler is installed in a patient, based on phase transition temperature characteristics of the memory alloy, the memory alloy is in an state in which the alloy constantly restores to an original state in a body temperature state, so that constant contraction force is generated to conduct effective, reliable and constant pressurizing on an anastomosis site to pertinently solve the problem of end-to-end anastomosis of a colonic area, and ensure that anastomosis forceis not affected by repeatedly opening and closing, and various kinds of complications are effectively and safely reduced, and the problem of difficult operation of the intestinal stapler during an operation is solved; the intestinal stapler can be excreted out of the body, and residuals do not remain in the body.