The present invention is a natural cooling type capable of quickly discharging the heat generated from the LED light source to the outside in a natural convection method using sea breeze in the process of emitting light from the LED light source and performing the function of a route mark for the navigation of a ship. Regarding the light fixture, the natural cooling light fixture according to the present invention comprises: a lower light body in which an electric device for controlling the operation of the light fixture is installed; A heat dissipation core in the form of a tube installed on the upper part of the lower lamp body and made of a thermally conductive material in which an inlet port through which air is introduced is opened; A light-emitting body module having a light-emitting body emitting light, and being connected to the outer surface of the heat-radiating core to transfer heat generated from the light-emitting body to the heat-radiating core; A shielding cover that is convexly installed on the upper end of the heat dissipation core and has an open outlet through which air inside the heat dissipation core is discharged; And, it is installed to be spaced apart from the upper side of the shielding cover, and the distance between the upper surface of the shielding cover increases as it goes outward based on a portion corresponding to the outlet of the shielding cover, so that the sea breeze passes through the point where the outlet is located. It may include; a protective cover that allows the flow rate to increase and the pressure to decrease.
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