The invention belongs to the technical field of block chain, and discloses a credit data storage method, device, apparatus and a storage medium based on the block chain. The method comprises the following steps: detecting a first selected instruction triggered by a user for any item to be processed in a credit application business flow list; displaying a list of items to be processed correspondingto the items to be processed in a user interface according to the first selected instruction; Monitoring a change in a cursor position in the selected task item in response to a user-triggered secondselected instruction for any of the task items in the to-be-processed list; when the cursor position is changed, the content input by the user in the selected task item is obtained and saved in a sub-storage block corresponding to the task item. The method can effectively solve the technical problems that the credit data in the prior art is insecure, and the user cannot select a task node to start processing according to the actual situation when processing the credit service, and the credit data can not be saved in real time.