Drilling-resistant safe lock

The utility model relates to a drilling preventing safe lock, which belongs to the technical field of locks for special use. The front part of a connected in series screw (3) arranged at the rear part of a lockset is provided with an alloy head (4). The connected in series screw (3) is integrated with the alloy head (4), which causes the safe lock (1) to be firmer. The safe lock can effectively prevent a drill bit damaging the connected in series screw arranged at the rear part of a lock core, a main lock connecting guide plate (2) can not fall off and the safe lock (1) can not lose functions. When a thief drilled the lock core to damage with the drill bit in a short time, the alloy head on the connected in series screw forms an obstacle. When the drill bit used by the thief hits the alloy head, because the alloy head adopts a nonplanar design, the drill bit can run along the slope of the alloy head and be broken and the thief can not open the safe thereby, the thief feels difficult to carry out stealing.