Anti-theft alarm structure for door lock

The invention relates to an anti-theft alarm structure for a door lock. The anti-theft alarm structure comprises a lock casing, a screw, a microswitch and a circuit board, wherein a through hole is formed in the lock casing, the screw penetrates through the through hole to fix a sliding cover onto the lock casing, the microswitch is arranged at the position perpendicularly far away from the through hole, the tail of the screw is in contact with the microswitch to enable an oscillating bar of the microswitch to be in a pressing state, and the microswitch is connected with the circuit board comprising a communication module through a line. The anti-theft alarm structure for the door lock is simple in structure. When someone enters a room maliciously, special tools are utilized to destroy the door lock through mechanical means, then, falling or skewing of the screw is caused by destroying of the door lock, therefore, the microswitch is disconnected with the circuit board, and when the circuit board receives the signal, a corresponding module sends out an alarm signal immediately. Accordingly, the anti-theft alarm structure for the door lock is high in alarm accuracy.