Ejection quality testing system, method and sampling auxiliary device

An ejection quality testing system (100), method and a sampling auxiliary device (20). The ejection quality testing system (100) comprises an ejection quality testing device (30), the ejection quality testing device (30) comprising an image acquisition device (31) and an image processor (32). The image acquisition device (31) is for acquiring a sampling image of at least one group of samples to be tested. The at least one group of samples to be tested are respectively taken from at least one group of preset sampling points of a preset sampling region in an ejection region. The image processor (32) is for acquiring the sampling images of each group of samples to be tested, performing image processing, and adopting a preset image algorithm, calculating ejection substance parameters per unit area of the image after processing.