The invention discloses a self-radiating collecting ring structure of an electric generator. A through screw rod is installed along the peripheral direction of a first collecting ring and a second collecting ring, and the through screw rod is sheathed with a through insulating sleeve. Between the first collecting ring and the second collecting ring, the lower end of the second collecting ring is provided with first and second wedge-shaped insulating cushion blocks, the lower end of the second wedge-shaped insulating cushion block is provided with a fixing ring, the through screw rod successively passes through holes correspondingly installed in the fixing ring, the second wedge-shaped insulating cushion block, the second collecting ring, the first wedge-shaped insulating cushion block, thefirst collecting ring and the insulating sleeve, and is locked and connected by nuts. Wedge-shaped surfaces are installed on the first and second wedge-shaped insulating cushion blocks. In the self-radiating collecting ring structure of the electric generator, while the electric generator is operated, the windward sides of the first and second wedge-shaped insulating cushion blocks rotated alongwith a rotor are able to provide a thrust force to the air, and the air in a cavity is pushed to be directionally flowed, so the cooling of the collecting ring body is promoted, and the temperature ofthe collecting ring is reduced. Carbon dusts are prevented from adsorbing or precipitating in a dead angle position through the rapidly flowed air.