a plurality of first cutting components elastically expandable in a radial direction, configured to cut a thrombus in a longitudinal direction of a blood vessel;

a plurality of second cutting components elastically expandable in the radial direction, configured to cut the thrombus in a circumferential direction of the blood vessel, wherein a second cutting component among the plurality of second cutting components comprises a proximal third connecting ring, a first connecting rod and a transverse cutting ring, a first end of the first connecting rod is connected to the proximal third connecting ring, and a second end of the first connecting rod is connected to the transverse cutting ring, wherein the transverse cutting ring comprises a third cutting ring and a fourth cutting ring, an inner diameter of the third cutting ring is less than an inner diameter of the fourth cutting ring, and the third cutting ring and the fourth cutting ring are sequentially disposed on the first connecting rod at intervals in an axial direction of a push tube; and

a collection device, configured to trap and collect a crushed thrombus;

wherein the plurality of first cutting components, the plurality of second cutting components and the collection device are sequentially disposed on the push tube from a proximal end of the step-cutting thrombectomy device to a distal end of the step-cutting thrombectomy device.