Self-locking steel seal theftproof device for watt-hour, water and gas meter

The utility model relates to a theftproof device for the self-lock steel seals of an electric meter, a water meter and a gas meter. The utility model is characterized in that the utility model locks a casing, a lock core, lock screws, and a middle sleeve enchased with a sealed steel sheet mutually into integration; the lock screws are clamped and can not be screwed out; the sealed steel sheet and the middle sleeve combine into integration; the code of the sealed steel sheet forms a unique corresponding relationship with a user. The utility model can effectively stop counterfeiting and unsealing and enhances the metering management of power supply (water supply, gas supply) departments. The utility model has the advantages of low cost and convenient operation. The utility model is an ideal replacement for existing lead seals.