The invention relates to an integrated car door lock and door knife device. The integrated car door lock and door knife device comprises a door knife base plate, a knife arm assembly, a linkage assembly and a lock hook assembly, wherein the knife arm assembly, the linkage assembly and the lock hook assembly are installed on the door knife base plate, the knife arm assembly is used for opening or clamping a door ball, and the linkage assembly is used for matching with the knife arm assembly and the lock hook assembly, so as to lock or unlock. According to the integrated car door lock and door knife device, a car door lock and a door knife are integrated, the structure is smart and reasonable, the manufacturing cost is low, whether a door machine is in a flat unlocking area can be directly judged by utilizing the door ball of a landing door, the flat area can be judged without additionally installing other devices on the landing door, and a certain error of installing the landing door ball is permitted, so that the landing door is conveniently installed and debugged. In addition, in the flat area, the door can be opened inside and outside in any condition; in non-flat and rescue areas, the door opening spacing does not exceed 50 mm inside, and the car door opening requirements in a modification list of a new national standard I are fully satisfied.