The utility model discloses a quick self-locking connector of a marine riser. The quick self-locking connector comprises a male connector, a female connector, a clamp spring, a sealing ring and a plurality of unlocking screws; the male connector and the female connector are sleeved; a sealing groove for installing a sealing ring and clamp spring troughs for installing clamp springs are arranged on the contact surfaces of the male connector and the female connector in a matching manner; and a plurality of thread perforations for installing the unlocking screws are peripherally and evenly arranged at the outer side wall of the female connector, corresponding to the clamp spring troughs in position. The quick self-locking connector has the advantages of being installed by utilizing self gravity, and being convenient and fast to detach, good in sealing property, and simple in structure.