Embodiments of the invention disclose a DMA (Direct Memory Access) data transmission method and apparatus, and solve the technical problem of directly influenced frame rate due to low DMA efficiency caused by the fact that the time of one frame of DMA is equal to the sum of linked list reading time, DDR image data reading time and PCI-E (PCI Express) image data sending time. The DMA data transmission method disclosed by the embodiments of the invention comprises: caching linked list data read from DDR to a preset linked list data cache region, and caching video data subjected to mode alignment processing through presetting and read from DDR to a preset video data cache region; and when the preset linked list data cache region is in a non-null state and the preset video data cache region meets a one-time burst transmission condition, sending the video data to the TX end of PCI-E in a preset mode.