Memory caching method and device for rapidly updating business

Provided are a memory caching method and a memory caching device for rapidly updating business. The memory caching method for rapidly updating the business includes: seeking in a memory cache based on cache seek key value of read external data, if seeking out the cache seek key value in the memory cache, performing business processing according to initial data stored in the memory cache and corresponding to the cache seek key value and the external data, updating a result into a position in the memory cache, where the initial data is stored, after the business processing is completed, and setting a modification mark corresponding to the position in a modified state. The memory caching method and the memory caching device for rapidly updating the business reduce frequency of operation of frequently submitting transactions for inquiry and updating, performed by a database when the data is rapidly updated.