Abstract: The existing data encryption of coal mine safety monitoring system is mostly in the form of database encrypted storage or file encryption, there are some problems such as the high performance overhead and unable to track data change records, which reduce the stability and safety of the safety monitoring system. According to the data tampering proofing requirements of coal mine safety monitoring system, a method is proposed that can identify, track and record tampering behaviors based on the combination of variable data capture mechanism and message digest encryption. This method achieves a good balance between safety, performance and storage, and has good compatibility.