The invention relates to a memory data read-write method and a memory data read-write device, which are used for accelerating the data read-write speed in a memory space. The method comprises the steps of: writing data in the memory space in an annular structure mode; during data reading, judging whether the memory space spaced by a data writing position and a data reading position is smaller than a preset space threshold value or not in a direction of writing data in the annular structure mode; when the memory space spaced by the data writing position and the data reading position is smaller than the preset space threshold value, skipping the data reading position according to preset strategies, and starting to read the data in the skipped position; and when the memory space spaced by the data writing position and the data reading position is greater than or equal to the preset space threshold value, reading the data in the memory space in the annular structure mode. Through the technical scheme, the data writing operation time delay caused by waiting due to data reading operation position conflict during data writing operation is enabled to be avoided; the data writing speed in the memory space is accelerated; and the condition that the slowest data reading speed in a plurality of user ends becomes the bottleneck of the data read-write speed in the memory space is avoided.