Automatic cleaning device

An automatic cleaning device, installed on an air conditioner, includes an air compressor, an air blowing member, a controller and a dust collector. The air compressor is installed in the outdoor unit, and has an air inlet part and an air delivery part with an air delivery valve. The air compressor inputs and compresses external air into a high-pressure air. The air blowing member is installed on the top of the blower of the indoor unit. The air blowing member outputs the high-pressure air to the blower. The controller includes a detecting part for detecting air pressure value of the high-pressure air and a controlling part. When the air pressure value is greater than or equal to a reference value, the controller controls the air delivery valve to open the air delivery part for outputting the high-pressure air. The dust collector collects things dropped by the blower.