Anti-theft door lock

The invention relates to the field of door locks, in particular to an anti-theft door lock. The anti-theft door lock comprises a door lock body, a connecting column, a placing plate, a placing hole, alubricating mechanism, a spraying mechanism, a spraying hole, a rotating shaft, a fourth torsional spring, a water outlet hole, a sliding groove, a water storage groove, a rotating block, a movable plate, a second spring, a water inlet hole, a fourth baffle, a water supply mechanism, a suction cavity, a limiting block, a third spring, a suction pipe and a filter ball. A correct key is inserted into the door lock body and then rotates, the connecting column drives the rotating block to slide in the sliding groove, the limiting block moves in the top end direction, a disinfectant enters the sliding groove through the filter ball and the suction pipe, and after a user loosens the door lock body, the fourth torsional spring automatically resets to drive the rotating block. At the moment, thedisinfectant in the slidin