Heat dissipation structure, electric appliance box, outdoor unit and air conditioner

The utility model provides a heat dissipation structure, an electric appliance box, an outdoor unit and an air conditioner, relates to the technical field of air conditioners, and solves the technical problem that the heat dissipation effect of the electric appliance box is common. The heat dissipation structure comprises a radiator which is arranged on a heating element in an attached mode and further comprises a drainage structure which is arranged between the radiator and the heating element and communicated with the external environment, and hot air at the position of the heating element can be drained into the external environment through the drainage structure. According to the utility model, the drainage structure is arranged between the radiator and the heating element, so that hot air in the electric appliance box is effectively discharged into the cavity of the outdoor unit on the basis of not changing the existing main body structure, not relating to the change of a mold, not greatly increasing the