A seat rod clamp assembly, comprising: an annular hoop having a notch, the annular hoop having a locking portion on each side of the notch, the annular hoop having a post hole, and the annular hoop being configured such that when the locking portions get close to each other, the post hole is deformed and locked; a wrench rotatably connected to the two locking portions, the wrench being configured to be axially rotatable along the axial direction of the post hole to a locking position and a release position; and at least one pair of eccentric washers, wherein one of the eccentric washers is fixed to one of the locking portions, the other of the eccentric washers is correspondingly fixed to the wrench, an end surface of each of the eccentric washers has an inclined surface, and the end surfaces of the two eccentric washers are abutted against each other, and wherein each pair of eccentric washers is configured such that: when the wrench is rotated to the locking position, the overall thickness of the two eccentric washers is thickened under the abutting guidance action of the inclined surface to make the two locking portions get close to each other; and a seat rod bushing fixedly connected to the annular hoop, interfaced with the post hole, and configured to guide a seat rod to pass through the seat rod bushing and the post hole; wherein the seat rod clamp assembly is configured for assembly on a seat tube, the annular hoop is configured to be fitted over an end of the seat tube, characterized in that the seat rod bushing is configured to extend from the end of the seat tube into the seat tube, and the annular hoop and the seat rod bushing are configured in a way that the end of the seat tube is located between them. an annular hoop having a notch, the annular hoop having a locking portion on each side of the notch, the annular hoop having a post hole, and the annular hoop being configured such that when the locking portions get close to each other, the post hole is deformed and locked; a wrench rotatably connected to the two locking portions, the wrench being configured to be axially rotatable along the axial direction of the post hole to a locking position and a release position; and at least one pair of eccentric washers, wherein one of the eccentric washers is fixed to one of the locking portions, the other of the eccentric washers is correspondingly fixed to the wrench, an end surface of each of the eccentric washers has an inclined surface, and the end surfaces of the two eccentric washers are abutted against each other, and wherein each pair of eccentric washers is configured such that: when the wrench is rotated to the locking position, the overall thickness of the two eccentric washers is thickened under the abutting guidance action of the inclined surface to make the two locking portions get close to each other; and a seat rod bushing fixedly connected to the annular hoop, interfaced with the post hole, and configured to guide a seat rod to pass through the seat rod bushing and the post hole; wherein the seat rod clamp assembly is configured for assembly on a seat tube, the annular hoop is configured to be fitted over an end of the seat tube, characterized in that the seat rod bushing is configured to extend from the end of the seat tube into the seat tube, and the annular hoop and the seat rod bushing are configured in a way that the end of the seat tube is located between them.