A centrifugal separation device for ball milling, and a ball milling system. The centrifugal separation device for ball milling comprises a separation inner cylinder (2) and a separation outer sleeve (1) fitted over the separation inner cylinder (2), wherein the separation inner cylinder (2) is provided with an inner cylinder separation hole (24); the separation outer sleeve (1) is provided with an outer sleeve separation hole (11) for enabling a material to enter the inner cylinder separation hole (24) and a medium conveying mechanism for providing energy for outward movement of a grinding medium during rotation. During use, the separation device rotates under the driving of a separation driving shaft (5), the separation driving shaft (5) is axially provided with a discharging channel (51), and the discharging channel (51) is communicated with the inner cylinder separation hole (24) and the outer sleeve separation hole (11); the medium conveying mechanism accelerates the grinding medium so that the grinding medium can be away from the separation outer sleeve (1), and the ground material having a small diameter is distributed nearby the separation outer sleeve (1). On one hand, energy is provided for the grinding medium nearby the separation device, and the grinding efficiency is improved. On the other hand, blockage caused by the fact that the grinding medium is distributed nearby the separation device during separation is avoided, and the separation efficiency is improved.
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