The invention discloses an image measurement method for flow parameters in a gas-liquid-solid three-phase system, comprising the steps of image acquisition, image preprocessing, artificial neural network modeling, phase volume fraction parameter extraction and the like, and the flow parameters such as gas phase area, liquid phase area, liquid phase fraction, gas phase fraction and the like can beobtained through the method. Furthermore, the image measurement method processes images at different moments under the same experiment condition to obtain data of the flow parameters changing along with time; Typical flow patterns such as trickle flow, pulse flow and bubbling flow can be identified through statistical analysis. The method can overcome the defects of the existing image recognitiontechnology, breaks through the limitation of extracting quantitative gas-liquid flow parameters by images, and further improves the recognition accuracy of the gas-liquid flow pattern.