The invention relates to a data storing system and a method based on cache. The system comprises: a first detecting unit for detecting the abnormality of a network connected with an application serveror the application server; a first disk file caching unit for the disk cache of the data collected from a client; and an application server for storing or processing data. The first detecting unit isrespectively connected with the first disk file caching unit and the application server. The first disk file caching unit is connected with the application server. The data storing method based on cache comprises the following steps: step 1, transmitting the data collected from the client to the disk file caching unit for disk cache; and step 2, transmitting the cached data in the disk file to the application server to be processed and stored. The system and the method in the invention cannot affect the storage of the collected data in the condition that the network service is abnormal or a certain module of the program is abnormal, thereby ensuring the integrity of the collected data and improving the efficiency.