Electric control component and air conditioner

The electric control component comprises a box body assembly, a circuit assembly and a radiator, an installation cavity and an air channel cavity which are arranged in an isolated mode are arranged in the box body assembly, the circuit assembly is installed in the installation cavity, the circuit assembly comprises a circuit board, a first device group and a second device group, and the first device group and the second device group are arranged on the circuit board. In the second direction perpendicular to the circuit board, the first device group and the second device group are located on the same side of the circuit board, the radiator covers the second device group, the installation cavity comprises a first cavity part containing the first device group, the air channel cavity comprises a first air channel part and a second air channel part, and the second air channel part is communicated with the first air channel part. The two sides, in the first direction, of the box body assembly are each provided with a ventilation opening communicating with the air duct cavity. Therefore, the working stability and reliability of the electric control component can be improved, the heat dissipation efficiency of the electric control component can be improved, and the production efficiency of the electric control component is improved.