The invention discloses a method and device for scheduling data transmission. The method and device are used for improving the utilization rate of transmission channels. The method includes the steps that a first transmitting side monitors the occupancy rate of the transmission channels in a bus protocol AXI, wherein the transmission channels comprise any one of an address read channel, a data read channel, an address write channel, a data write channel and a response write channel; the first transmitting side transmits an event processing request corresponding to the transmission channel to a first receiving side through the transmission channels; when the occupancy rate of the transmission channels is larger than a preset threshold value, the first transmitting side encodes and sets reserved bits in a target channel, the encoded reserved bits are used for identifying the event processing request and need to be scheduled to the target channel, wherein the target channel is one of the transmission channels; the first transmitting side transmits the event processing request to a second receiving side through the target channel according to the encoded reserved bits, and the encoded reserved bits are further used for allowing the second receiving side to write the event processing request into the first receiving side.