File management method, device, electronic equipment and system

The invention provides a file management method and device, electronic equipment and a system, and relates to the technical field of block chains. The method comprises the steps that a smart contract deployed in a block chain network receives file related information sent by a first SIM card in a first terminal device serving as a block chain node; based on the file related information, obtaining a corresponding to-be-shared file from the block chain network, and adding corresponding use limitation information in the to-be-shared file to obtain a target file; and uploading the target file to the block chain network, and sending a sharing voucher corresponding to the target file to a second SIM card in a second terminal device as a block chain node, the sharing voucher being used by the second SIM card to obtain the target file from the block chain network. The first terminal device shares the file needing to be shared to the second terminal device, and the shared file is stored in the block chain network and