Garbage collection optimization method and device based on storage array data access

The invention discloses a garbage collection optimization method and device based on storage array data access, and the method comprises the steps of carrying out the classification discrimination of a received data access request according to a request source and a preset data cold and hot classification algorithm, and obtaining corresponding classification information; calling a cache queue algorithm according to the classification information to perform cache judgment on the data access request so as to add the data access request into a target cache queue of a corresponding classification; if the to-be-accessed data in the target cache queue reaches a preset standard threshold value, writing the to-be-accessed data into a corresponding target node by taking a stripe as a unit according to the address mapping table; if no writable storage space exists in the storage array or the number of blank nodes in the work queue is smaller than the preset number, performing data recovery through a garbage recovery me