the invention discloses an absorbable iron alloy stent , comprising an iron alloy substrate and a degradable polymer in contact with the surface of the substrate , in which the degradable polymer has a weight average molecular weight of more than or equal to 20 , 000 and less than or equal to 1 , 000 , 000 and a polydispersity index of more than 1 . 0 and less than or equal to 50 . after the iron alloy stent is implanted into the body , the degradable polymer degrades to produce a carboxyl group . after the degradable stent is implanted into the human body , the effects of oxygen - consuming corrosion enable the stent both to mainly function as a mechanical support and then to degrade gradually , and the amount of hydrogen produced in the degradation process does not reach the level that can lead to a risk of air embolism .