(EN) An outdoor unit of air conditioner comprises a unit body and an electrical components box, a blower, a compressor and a condenser all installed in the unit body, the electrical components box comprising an electrical box cover (1), an electrical box (4), and a circuit board (2), for installing electrical elements and a radiator (9), the circuit board (2) being fixed in the electrical box (4), and the electrical box cover (1) being mounted on a top of the electrical box (4), and a separator box body (12) being located between the electrical box (4) and the blower, and a left side (15) of the separator box body (12) is fixed on the condenser (17) and a front side (16) of the separator box body (12) is fixed on a separator board (13) of the unit body.