Method and apparatus for a safety lock assembly for a cam lock fitting mounted onto the outside of the cam lock fitting so that the safety lock mechanism is in close proximity to the cam levers so that when the cam lock fitting is pressurized and the operator attempts to open the cam lock fitting the safety lock mechanism will prevent operation or separation of the male and the female portions of the fitting. This is accomplished by having slidable axles mounted in elongated slots in the bosses adapted to slide in response to movement of a safety lock mechanism handle so that the male and female portions of the cam lock fitting initially only slightly separate allowing the operator to quickly reclose the cam lock fitting if the operator observes that the cam lock fitting is still pressurized.