A memory management method and a device, where the method includes: receiving a memory access request, where the memory access request carries a virtual address; determining a page fault type of the virtual address if finding, in a translation lookaside buffer TLB and a memory, no page table entry corresponding to the virtual address; allocating a corresponding page to the virtual address if the page fault type of the virtual address is a blank-page-caused page fault, where the blank-page-caused page fault means that no corresponding page is allocated to the virtual address; and updating the page table entry corresponding to the virtual address to the memory and the TLB. The memory manager does not generate a page fault when a blank-page-caused page fault occurs, but allocates a corresponding page to the virtual address. Therefore, a quantity of occurrences of the page fault is reduced, thereby improving memory management efficiency.