Safety door lock

According to the technical scheme, the safety door lock is characterized in that the safety door lock comprises a lock shell, a mounting plate, a push plate, a lock cylinder and a rapid locking mechanism, and the rapid locking mechanism comprises a lock cylinder driving piece, a tripping driving piece and a tripping button; a driving arm is arranged on the lock cylinder driving piece, and in the rotating process of the lock cylinder driving piece, the push plate can be pushed through the driving arm to slide into the lock shell until the lock cylinder driving piece is buckled with the tripping driving piece; a torsion spring is arranged between the tripping driving piece and the lock shell, one end, in the lock shell, of the tripping button is hinged to the tripping driving piece, the other end of the tripping button is a touch round head, and the torsion spring can enable the tripping button to always maintain a to-be-touched state that the touch round head protrudes out of the mounting plate through the tri