The invention discloses a high-voltage brushless direct-current generator structure. The high-voltage brushless direct-current generator structure comprises a stator, a brushless rotor, an excitation assembly, a belt pulley and a shaft, wherein one end of a radiating shell is connected with a front radiating end cover, and the other end of the radiating shell is connected with a back radiating end cover; the stator, the brushless rotor and the excitation assembly are arranged between the front radiating end cover and the back radiating end cover; a radiating fan is arranged on the outer side of the back radiating end cover; and a fan shroud is arranged on the outer side of the radiating fan, and is connected with the back radiating end cover. The high-voltage brushless direct-current generator structure adopts the structure that a cooling fan is arranged on the outer side of the back radiating end cover, electrostatic interference is prevented from being generated on the generator; the front radiating end cover, the back radiating end cover and the radiating shell form a sealing structure, so that car washing flush water can be effectively isolated from entering the interior of the generator; the radiating shell, the front radiating end cover and the back radiating end cover are provided with radiate radiating ribs respectively, so that the radiating area is increased; through the manner that a base is arranged on the radiating shell, a motor and the generator are in the same vibration frequency integrally, and moreover, the vibration and impact of the generator can be effectively absorbed through the transmission manner of the belt pulley.