Heat dissipation mechanism and rectification power box

The utility model discloses a heat dissipation mechanism and a rectification power box, comprising a bearing assembly comprising an exhaust groove arranged on an accommodating shell and an electric control door which can be opened and closed on the accommodating shell, an air cooling assembly comprising an air guide shell and a first heat dissipation hole arranged on the air guide shell, the air guide shell is arranged in the containing shell, and the ventilation assembly is arranged on the adaptation hole in a matched mode and communicates with the air guide shell. According to the utility model, the electrical components are arranged on the air guide shell and are separated by the heat dissipation shell communicated with the air guide shell, heat dissipation is carried out on each electrical component independently, and meanwhile, the ventilation assembly used for air flowing is arranged at the position, close to the bottom, of the accommodating shell provided with the electrical components; and hot air flo