Electronic evidence calling method and device based on block chain, equipment and medium

The invention relates to a block storage system technology, and discloses an electronic evidence calling method based on a block chain, which comprises the following steps: obtaining original electronic evidence from a law enforcement agency system, and carrying out evidence classification on the original electronic evidence to obtain classified electronic evidence, storing the classified electronic evidence into a plurality of nodes of the block chain according to the category of the classified electronic evidence, receiving an evidence calling request, judging whether a sender of the evidence calling request is a participant of the standard alliance chain, and if the sender of the evidence calling request is the participant of the standard alliance chain, sending the evidence calling request to the block chain; and obtaining an intelligent contract pre-stored in the block chain, judging whether the classified electronic evidence in the block chain accords with an evidence rule in the intelligent contract, a