Radiator and air conditioner outdoor unit

The utility model relates to the technical field of air conditioners, and discloses a radiator which comprises a radiating base. The second heat dissipation plate is detachably connected with the first heat dissipation plate and used for receiving heat transmitted by the heat source module; wherein a closed containing cavity is formed between the first heat dissipation plate and the second heat dissipation plate, the containing cavity is filled with a flowable heat transfer medium, and the heat transfer medium flows in the containing cavity so as to diffuse and transfer heat. The heat transfer medium flows in the containing cavity, heat transferred by the second heat dissipation plate can be diffused to the periphery, the temperature uniformity is improved, and the heat transfer efficiency of heat transferred from the second heat dissipation plate to the first heat dissipation plate can be improved; the radiator is applied to the air conditioner outdoor unit, flowing of the heat transfer medium can be acceler