The invention discloses a management method for memory space of an electronic hard disk, which comprises a central processing unit (CPU), an interface controller, a static random access memory and a memory. The memory comprises a plurality of memory blocks, and each memory block is divided into a data zone and a status tag zone. The status tag zone comprises a logic address tag, a data storage status tag, and a memory block tag, wherein the data storage status tag is used for storing the status whether data is written into the status storage data zone, and the logic address tag is used for creating an logic address of the data zone after the data is written into the data zone. The electronic hard disk is connected with an external data processor to initiate the electronic hard disk, and the static random access memory is used for creating a look-up table in which the memory block tag of the memory block is corresponding to the memory block. In the invention, the electronic hard disk operates the memory block that needs data read-write operation through the look-up table created by the memory block tag, so as to save data operation time and improve the management efficiency of the electronic hard disk.