An airbag inflator, comprising: an inflator module; an exhaust hood corresponding to one end of the inflator module to form an accommodating space in a concave shape, wherein the exhaust hood is set on the inflator module; and a plurality of exhaust holes disposed on a sidewall of the exhaust hood and being adjacent to the exhaust hood opposite to one end of the inflator module; characterized in further comprising: a flow-guiding loop, one side thereof attached to the exhaust hood corresponding to one side of the inflator module, and the other side of the flow-guiding loop extending to the inflator module to form an annular convex rib; wherein the annular convex rib and the flow-guiding loop includes round corners at positions corresponding to one side of the inflator module and a gap is disposed between the annular convex rib and the sidewall of the exhaust hood; wherein when the inflator module is activated, the inflator module guides a first airflow and at least one residue toward the side of the exhaust hood, the other side of the flow-guiding loop and the annular convex rib guide the first airflow and the at least one residue to flow toward the inflator module, and the first airflow is guided to flow out of the exhaust hood from the plurality of exhaust holes and the at least one residue is left in the concave shape of the accommodating space. an inflator module; an exhaust hood corresponding to one end of the inflator module to form an accommodating space in a concave shape, wherein the exhaust hood is set on the inflator module; and a plurality of exhaust holes disposed on a sidewall of the exhaust hood and being adjacent to the exhaust hood opposite to one end of the inflator module; characterized in further comprising: a flow-guiding loop, one side thereof attached to the exhaust hood corresponding to one side of the inflator module, and the other side of the flow-guiding loop extending to the inflator module to form an annular convex rib; wherein the annular convex rib and the flow-guiding loop includes round corners at positions corresponding to one side of the inflator module and a gap is disposed between the annular convex rib and the sidewall of the exhaust hood; wherein when the inflator module is activated, the inflator module guides a first airflow and at least one residue toward the side of the exhaust hood, the other side of the flow-guiding loop and the annular convex rib guide the first airflow and the at least one residue to flow toward the inflator module, and the first airflow is guided to flow out of the exhaust hood from the plurality of exhaust holes and the at least one residue is left in the concave shape of the accommodating space. a flow-guiding loop, one side thereof attached to the exhaust hood corresponding to one side of the inflator module, and the other side of the flow-guiding loop extending to the inflator module to form an annular convex rib; wherein the annular convex rib and the flow-guiding loop includes round corners at positions corresponding to one side of the inflator module and a gap is disposed between the annular convex rib and the sidewall of the exhaust hood; wherein when the inflator module is activated, the inflator module guides a first airflow and at least one residue toward the side of the exhaust hood, the other side of the flow-guiding loop and the annular convex rib guide the first airflow and the at least one residue to flow toward the inflator module, and the first airflow is guided to flow out of the exhaust hood from the plurality of exhaust holes and the at least one residue is left in the concave shape of the accommodating space.