Method, device and equipment for writing back memory data

The invention discloses a write-back method, device and equipment for memory data. The residual capacity of the memory space of the terminal equipment is monitored; if it is monitored that the residual capacity of the memory space of the terminal equipment is smaller than a preset capacity threshold value, performing write-back processing on the memory data in the exchange partition; wherein the exchange partition is used for storing memory data needing to be subjected to write-back processing; and if monitoring that the residual capacity of the memory space of the terminal equipment is not less than a preset capacity threshold value, performing write-back processing on the memory data in the exchange partition based on a write-back period of the memory data. Therefore, different modes can be selected to write back the memory data of the exchange partition according to the residual capacity of the memory space of the terminal equipment, useless write-back can be avoided, the utilization rate and the use value