The invention discloses a nonmetal beacon light buoy body structure. The nonmetal beacon light buoy body structure comprises a buoy body and a light frame. The buoy body is a circular truncated cone composed of four right-angle fan-shaped platforms. Two edges of the arc-shaped surfaces of each right-angle fan-shaped platform are provided with grooves. Threaded through holes are formed in the grooves. The four right-angle fan-shaped platforms are sequentially connected and fixed through studs. A center pipe hole channel is reserved in the middle of the buoy body. Semicircle slots are formed in the right-angle sides, on the upper surface and the lower surface of the buoy body, of the right-angle fan-shaped platforms. A buoy framework is inserted into the center pipe hole channel and the semicircle slots. A counterweight made of a cast steel material is installed in the position, below the buoy body, of the bottom of the buoy framework. A square plate for supporting a light stand is welded to the position, above the buoy body, of the upper portion of the buoy framework. The two sides and the top of the light stand are provided with ladders. A main body of the nonmetal beacon light buoy body structure is prepared by ultralow-density polyethylene through rotational molding, the structure is not prone to being attached with parasites by being placed in sea for a long time, is consistent in overall inside and outside color and cannot be discolored along with prolonging of time, and the maintenance cost is reduced; and in addition, the structure can be recycled after being subjected to collision or intense external force tearing.