Simple door lock

The utility model relates to the technical field of door locks, and discloses a simple door lock which comprises a mounting plate, a limiting cylinder is arranged at the top of the mounting plate, a fixing rod is arranged on the inner wall of the limiting cylinder, and the outer wall of the fixing rod is connected with the inner wall of the limiting cylinder in a sliding mode so that the fixing rod can conveniently ascend, descend and slide in the inner wall of the limiting cylinder. A manual pulling plate is manually pulled to drive a steel cable to move, and a fixed rod is welded and fixed to the end, away from the manual pulling plate, of the steel cable, so that the steel cable drives the fixed rod while moving. Then a sliding groove which is formed in the top of a mounting plate and facilitates sliding of a manual pulling plate is utilized, so that the manual pulling plate slides in the inner wall of the mounting plate, and then the manual pulling plate can enter the inner wall of a limiting cylinder fro