Simple lock catch

The utility model relates to a simple lock catch which comprises a fixed part and a movable part which are made of rigid materials. The fixing part comprises a door-shaped frame, a tubular lock cylinder and a lock cylinder fixing rod, the door-shaped frame is horizontally placed, one end of the door-shaped frame is fixed to a wall, the tubular lock cylinder is arranged on the lock cylinder fixingrod in a sleeving mode and can rotate around the lock cylinder fixing rod, and the two ends of the lock cylinder fixing rod are fixed to the door-shaped frame. The distance between the lock cylinder fixing rod and the short edge of the door-shaped frame is smaller than the maximum inner diameter of the tubular lock cylinder, and the distance between the lock cylinder fixing rod and the wall face is larger than the maximum outer diameter of the tubular lock cylinder. The movable part comprises a fixing device and a rectangular frame, the length of the long edge of the rectangular frame is larger than the maximum outer