Safety door lock

A safety door lock belongs to the technical field of locks. The door lock comprises a door lock body, a door grip and a lock cylinder. A protective frame is fixed to the outer side of the door lock body. First limiting grooves are formed in the two sides of the interior of the protection frame correspondingly. First limiting protruding blocks are fixed to the two sides of the door lock body respectively, a positioning mechanism is connected between the first limiting protruding blocks and the protective frame, the positioning mechanism comprises a first telescopic spring, a first movable groove and a positioning column, a limiting column is movably arranged on the inner side of the tail end of the door handle, and a push rod is movably arranged at the joint of the door lock body and the door handle. By means of the protection frame and the positioning mechanism, the door lock body is limited on the inner side of the protection frame, shaking of the door lock body is avoided, the positioning mechanism has a bu