Monitoring video anti-deletion system and method based on block chain

The invention relates to a monitoring video anti-deletion system and method based on a block chain, and the system at least comprises a plurality of camera assemblies (1) which are used for shooting videos; the at least one photographer node (2) is used for being connected with a block chain network and randomly generating a key pair; cutting a video file sent by the camera component (1) into a plurality of video file blocks, randomly sending the video file blocks to each node in a block chain network for storage, and recording a stored file hash value and node information; and the block chain network device updates the video file hash value uploaded by the photographer node based on the smart contract. According to the invention, the video uploading storage time of the camera is recorded through the smart contract on the block chain, and a non-tampering time reference is provided for law enforcement; a redundant space does not need to be introduced while the video record is prevented from being maliciously d