The invention discloses an air-conditioner PCB mounting structure. The air-conditioner PCB mounting structure comprises a mounting box of a PCB, the mounting box of the PCB is detachably mounted on an air-conditioner face board, and the PCB can be placed inside the mounting box; a protection structure of the PCB can package the PCB inside the mounting box when the PCB is placed into the mounting box for installation. According to the air-conditioner PCB mounting structure, by means of an embedding and sealing type PCB fixing mode, the PCB can be sealed and prevented from water contact, so that short circuit can be avoided, and damage to electronic components can be avoided, further the safety performance of products can be improved and the maintenance cost can be reduced.