A banknote kicking assembly, a sheet medium separation mechanism, a banknote box, and a banknote processing apparatus. The banknote kicking assembly (10) comprises a support shaft (2), a banknote kicking roller (4), a first support arm (31), and a second support arm (32). The banknote kicking roller (4) comprises a core shaft (41) and a banknote kicking wheel (42) fixedly sleeved on the core shaft (41). The core shaft (41) has a first end (411) and a second end (412). The first support arm (31) and the second support arm (32) are each independently and rotatably fitted to the support shaft (2). The first support arm (31) is provided with a first core bore (312), and the second support arm (32) is provided with a second core bore (322). The first end (411) is inserted in the first core bore (312), and the first end (411) is in clearance fit with the first core bore (312). The second end (412) is inserted in the second core bore (322), and the second end (412) is in clearance fit with the second core bore (322).
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