Data storage method and system for reducing loss of storage medium

The invention discloses a data storage method and system for reducing the loss of a storage medium, and is applied to the field of automatic production of batteries. The method is applied to a middle computer, when the middle computer is connected with an upper computer, data of a lower computer are cached through a plurality of local write cache regions, and the currently cached data are sent to the upper computer in real time; when the lower computer is disconnected from the upper computer, writing data in the write cache region which is fully written at present into a local storage medium, and writing new data sent by the lower computer into the write cache region which is not fully written at present in a disconnection state keeping process; and reading the data stored in the storage medium to a local read cache region, and sending the data to an upper computer, so that the upper computer analyzes the received data. By establishing the write cache region and the read cache region in the memory, erasing of