The invention discloses a data storage and query method and device, a computer system and a readable storage medium. By utilizing a block chain database, the block chain database is provided with a plurality of proof nodes, and the method comprises the following steps of receiving a proof file, encrypting the proof file, and storing the proof file; receiving the query application and the client authentication information, and outputting a query authority according to the query application and the client authentication information; and receiving a query instruction and outputting the proof fileaccording to the query instruction. According to the invention, nodes except the block chain database are prevented from tampering the proof file; the comprehensive evaluation result of the company is influenced by counterfeiting and counterfeiting, and meanwhile, the situation that a certain proof node in the block chain database tampers proof files responsible for other proof nodes is also avoided, so that the credit of the comprehensive evaluation result of the company is improved. The method adapts to the requirement of the related party for the proof file of the client, protects the private data, and eliminates the risk of commercial secret leakage.