Lock with double-lock core structure having good anti-theft effect and key matched with same

The invention relates to a lock with a double-lock core structure having good anti-theft effect and a key matched with the same. The lock comprises an inner lock core, an outer lock core, a magnetic shield sleeve, an anti-prizing sleeve and a key, wherein the inner lock core and the outer lock core are mutually and sequentially sleeved; the anti-prizing sleeve is covered outside the magnetic shield sleeve; the key is matched with the lock; a round lock core hole through which the outer end of the inner lock core passes in a matching mode is formed in the center of the anti-prizing sleeve; a key hole is formed on the outer end surface of the inner lock core; the inner lock core and the outer lock core as well as the outer lock core and the magnetic shield sleeve are aixally positioned by clamping rings; the magnetic shield sleeve and the anti-prizing sleeve are fixedly connected with each other; and first marble holes matched with each other are formed between the inner lock core and the outer lock core. A spr