The embodiment of the invention provides an IO dispatching method. The method includes the steps that for high-priority service, a high-priority IO execution request is received; responding to the fact of meeting the current first low-priority IO awaking condition, low-priority IO is triggered, and an execution traffic permit is issued, and low-priority IO awaking signals are sent; high-priority IO execution is dispatched; for low-priority service, the low-priority IO awaking signals are monitored, and responding to the received low-priority IO awaking signals, the judgment on low-priority IO dispatching condition is triggered; responding to setting of the low-priority IO dispatching condition, low-priority IO execution is dispatched. While it is ensured that high-priority IO is dispatched in time without being blocked by low-priority IO, low-priority IO will not starve to death. In addition, the invention provides an IO dispatching device and equipment.