The invention relates to the electronic product quality detection and machine vision field, provides a power source coil loosening detection method and device, a computer readable storage medium and terminal equipment and aims to improve power source coil loosening detection efficiency and precision. The method comprises steps that through acquiring an image of a power source coil, a first image characteristic Q' of the power source coil and a second image characteristic P' of a to-be-detected power source coil are acquired; machine learning of the image characteristics of samples is carried out, and characteristic matrixes MQ and MP are respectively acquired; through characteristics Q and P of a to-be-detected image, MQ*Q and MP*P are calculated and are respectively compared with thresholds TH1 and TH2, and whether a loosening defect exists can be determined. The method is advantaged in that detection efficiency and precision are substantially improved compared with the prior art.