The mold monitor mainly establishes the model by collecting qualified images of the mold or product, and then takes real-time images at the same time period and the same position of each fixed cycle to compare with the model. The software automatically compares and analyzes the abnormal situation, and then prevents the equipment from continuing the next step, such as forbidding the ejector pin or continuing to close the mold, so as to avoid equipment damage Injury or produce more unqualified products. The mold protector can effectively deal with various potential problems, so as to avoid stopping the machine for repair, reduce the production cost, improve the product quality and guarantee the delivery period.