Electric control box, air conditioner indoor unit and air conditioner

The utility model relates to the technical field of household appliances, and discloses an electric control box. The electric control box comprises a box body, a first adsorption device, a detection device and a warning device. The box body is provided with an installation cavity used for installing electrical elements. The first adsorption device is arranged on the outer side of the box body and used for adsorbing leaked refrigerants. And the detection device is arranged in the mounting cavity of the box body. And the warning device is electrically connected with the detection device. Therefore, if refrigerant leakage occurs in the air conditioner indoor unit adopting the electric control box, the first adsorption device can adsorb the leaked refrigerant. Meanwhile, if the detection device detects that the concentration of the refrigerant permeating into the box body is larger than or equal to the preset concentration, a warning state can be triggered so as to remind a user to take related measures. Through