The invention relates to an antitheft lock with an automatic triggering function. The antitheft lock with the automatic triggering function is characterized in that a trigger mechanism is included; the trigger mechanism comprises an unlocking block and a trigger plate; the unlocking block is rotationally installed on a lock shell and provided with a first rotating part pushed and pressed by a latch bolt assembly, a third rotating part pushed and pressed by an insurance bolt assembly and a second rotating part for triggering the trigger plate; and the trigger plate is slidably installed on thelock shell, one end of the trigger plate is controlled by the unlocking block, and the other end of the trigger plate is provided with an unlocking end for unlocking/locking a dead-bolt assembly. Theantitheft lock with the automatic triggering function has the characteristics that the width and thickness of a lock body are small, and the lock can be used for door bodies of different materials; adead-bolt is not triggered when any spring bolt is pressed; the structure is simple and reliable, the antitheft performance is high, and the lock is suitable for any opening mode and is convenient toinstall and use.