The invention relates to an intelligent control method for ensuring constant-pressure output of an air compressor. The intelligent control method specifically comprises the following steps that a computer control system continuously adjusts the output frequency of a frequency converter through the detected deviation between air consumption of a air utilization equipment and air production of the air compressor, the rotating speed of the air compressor is controlled in real time, the air production of the air compressor matches the air consumption of the air utilization equipment, and the constant-pressure output of the air compressor is realized. The constant-pressure output of the air compressor reduces the fluctuation of the current, the operation current, and the operation energy consumption of the air compressor; and meanwhile, when the air compressor is used as an air source device in the bottle blowing production line, the stable exhaust pressure of the air compressor ensures thequality of products on the bottle blowing production line.