The utility model provides a pair of a cable joint for outdoor knife switch is connected with the low reaches cable in the male joint, be equipped with upper reaches cable in the female joint, be equipped with the contact pin in the male joint, the low reaches cable is worn to establish and is connected in the accommodation hole and with the contact pin electricity, be equipped with in the female joint with contact pin complex inserted block, the jack has been seted up on the inserted block, be equipped with the conducting strip in the jack, upper reaches cable passes through the conducting strip and is connected with the contact pin electricity, upper reaches cable is connected with grounding switch blade or isolator electricity, the low reaches cable is connected with load or transmission line electricity, when changing grounding switch blade or isolator, utilize female joint and upper reaches cable conveniently to be connected grounding switch blade or isolator with low reaches cable electricity, when changing grounding switch blade or isolator, need not reform transform or change the low reaches cable, grounding switch blade or isolator change very conveniently, the efficiency of grounding switch blade or isolator's change is greatly improved.