Storage access method and device

The invention discloses a storage access method and device. The method includes: selecting one buffer interval from each buffer area stored unexecuted access commands; traversing all the unexecuted access commands stored in the buffer interval, sequentially acquiring each command group, and using the currently acquired command group as a to-be-executed command group, wherein all the access commands in the command group carries the same row address; sequentially sending the subcommand of each access command of each to-be-executed command group into a storage according to preset rules so as to allow the storage to execute the subcommand, wherein the access commands in the to-be-executed command group are transmitted according to acquiring sequence, the first acquired access command in the to-be-executed command group is disintegrated into a pre-charging subcommand, an activating subcommand and a line access subcommand in executing sequence, and each of the other access command in the to-be-executed command group is disintegrated into a line access subcommand.