The invention discloses an off-line printed circuit board assembly (PCBA) cleaning machine. The off-line PCBA cleaning machine comprises a machine body. A cleaning chamber, a liquid-confecting filtering chamber, a liquid storing chamber and a drying chamber are arranged in the machine body. A spraying device and a cleaning basket swing device are installed in the cleaning chamber. An automatic proportioning device and a filtering device, a water pump and a pneumatic diaphragm pump are installed in the liquid-confecting filtering chamber. The off-line PCBA cleaning machine can proportion liquid automatically and delivers proportioned cleaning liquid to the cleaning chamber through the pneumatic diaphragm pump. The proportioned cleaning liquid is delivered into the spraying device after the water pump is pressurized. Temperature and pressure are controlled and a PCBA board is cleaned. Meanwhile, the swing of the cleaning swing basket device is controlled so that the PCBA board is cleaned more adequately. Cleaned liquid is collected into the filtering device through the pneumatic diaphragm pump. The cleaned liquid returns to a diluent liquid chamber after the cleaned liquid is filtered. The cleaned liquid is again used for cleaning the PCBA board. Compared with the prior art, the off-line PCBA board cleaning machine can clear harmful pollutants on the PCBA surface such as residual scaling powders, soldering pastes, tin balls, impurities, dusts and oil stains. The off-line PCBA board eliminates the harm of corrosion and static, prolongs service life and meets high-quality and high-reliability requirements required by clients preferably.