The invention discloses an automatic locking type waterproof connector and an installation method thereof. The automatic locking type waterproof connector comprises a male head and a female head, one end of the male head is fixedly provided with a plug, one end of the female head is provided with a jack, the plug is slidably plugged with the jack, the outer wall of the plug is fixedly provided with a plug block, the inner wall of the jack is provided with a slot, and the plug block is clamped with the slot. Locking mechanisms are installed on the outer walls of the male head and the female head, connector lugs are fixedly installed at the other ends of the male head and the female head, wiring terminals are fixedly sleeved with the connector lugs, the wiring terminals are in point connection with the plugs and the jacks respectively, the connector lugs are sleeved with one ends of connecting sleeves through threaded structures, and sealing assemblies are installed at the other ends of the connecting sleeves. A line penetrates through the connecting sleeve and is electrically connected with the wiring terminal, then the connector lug is in threaded connection with the connecting sleeve, the sealing assembly clamps and seals the line and the connecting sleeve, waterproof sealing of the line connecting position is achieved, the plug is inserted into the jack, the inserting block is clamped into the slot, automatic locking is achieved through the locking mechanism, loosening of the connector in the using process is avoided, and the electrical connection stability is improved.